I'm not understanding where you're assuming a couple of days of interaction. I suppose I didn't specify a time line, but in order to notice "issues" and "red flags," you're going to have to normally spend more than a few days communicating with someone before you see patterns forming. Unless, of course, you're dealing with a very unpleasant sort of person.
I have several examples from my life when it happened on a frame of a couple of days. And of course there were also few examples where the time frame was longer -- but the number of such examples is far fewer simply because "most" of my interactions don't survive past first few days, hence my grudges.
But, speaking of those "fewer" interactions that lasted longer, I still feel they were also unfair but in a different way: during all this "long" time when there was a certain pattern, why didn't they ever let me know it bothers them? Why did they wait all this time saying nothing and then said "oh by the way there was this patter so I am done". I think in this case they owe me some extra time to correct it seeing how they didn't give me a chance to correct things before by telling me what bothers them.
As for clicking with someone immediately, I believe that is precisely the catalyst that sparks continued communication. Why would you spend time talking to someone who doesn't stimulate you on some level?
I guess I am more talking about the cases where we did stimulate each other on some level but then something came up that made it less than perfect and, instead of taking time to solve it, they left just because they wanted it perfect immediately or never.
Of course, I've also been in online conversations with people, both male and female, whom I thought I clicked with initially, but our common interests eventually exhausted themselves and we had no more to discuss. It's not always a phenomena related to romance. Friends as well as potential mates disappear on a whim. It happens to the best of us.
The dynamics is different though. When the common interest "exhaust themselves" its a gradual process, in which both parties know they are bored with each other. On the other hand what I am talking about is where one person sees a lot in common while the other person ignores all of it because of some red flags that made it not count. I am especially thinking of scenarios where both people saw things in common but then due to red flags the other person denies what she used to feel herself as well.
I get the feeling you take things very personally though. You shouldn't really. You should shrug it off like the rest of us do, and keep moving. The more you look back, the more likely you will be to miss opportunities in the future. Let it go.
I think what makes it harder for me is that I don't have friends like others do. So when others are ditched they fall back on their support network of friends. I have nothing to fall back on.
Of course, when you ask "why," you need to be prepared for a totally honest answer, which in some cases is not to the person's liking. It could be that most people (esp. NTs) want to avoid awkwardness and possible confrontation, so they just split.
Yeah I have examples of that too. Here are some of them:
1. I told a girl that my mom shelters me and she decided that it means I require sheltering which she couldn't provide. But then she didn't give me a chance to explain that just because my mom shelters me it doesn't mean I require it; on the contrary I am mad at my mom for this very thing
2. A girl noticed that the skype kept acting up when I talked to her, and she decided I talk to another girl at the same time. Now this was the girl I had two year relationship with albeit long distance so this assumption was crazy and factually wrong
3. I told a girl that I have Asperger and she decided that it means that I am just like Sheldon in Big Bang Theory and don't have feelings. I didn't get a chance to point out to her that its silly to use some stupid movie as a medical guide for Asperger and just because I have a label doesn't mean I can't feel things
4. I told a girl about a school I was going to and she asked why would a good Christian guy go to that school because its party school. I thought she was joking with me so I just shrugged off that question and probably didn't even answer it. But then it turned out she wasn't joking, it was serious question. She then decided I am only into parties just because I go to that school, and I didn't have chance to explain that I am not partying at all.
Anyway, I admit all those cases hurt just as much as the cases where I didn't get any explanation, just in a different way. BUT the reason they hurt is because all those assumptions were wrong and I dind't get a chance to tell them that they were wrong. So still the factor of "not giving enough time" is there, and this factor is what hurts me. In one case, they "don't have time" to state their reasons, in the other case they "don't have time" to hear my rebuttal. But IF they were to give it enough time the who knows maybe things would have worked between us since I would have explained why their reasons are wrong. Or, IF they were to stick to their decision, then that would be because of some other, better, reasons which I would have been able to accept. Like for example if a girl doesn't want to date me because I don't have stable job, I won't be arguing with that. I am only arguing if it is silly things like above. Well if silly reasons are the ONLY reasons then why not address all of them and get back together? If on the other hand, those are just icing on a cake and there is something else, such as not having stable job, then I would have accepted it.