If you don't think there's anything funny about throwing things at people, no matter
what the intentions are behind it, then I can totally see why this is a genuine problem for you. If you're going to address it with your bf, though, I'd wait until a neutral time if I were you, and keep it simple like
Progster suggested. Since there is obviously a gap in understanding between you two on this one, he may feel too defensive or confused to really digest your message if it comes in a moment of frustration. Hearing your side via a display of emotion will likely feel like an overreaction to him after he's asserted that he was only being playful.
In his mind, probably:
He's explained. >> Explanations neutralize emotional situations with information. >> You're
still emotional >> Your point of view is irrational.
If you press the issue when your emotions are elevated, he may end up focusing on your
upset rather than on what's actually upsetting you. See what I mean?
As for the little attachment you posted, I don't think this is very accurate. An Aspie may feel their stated good intentions cover the situation, but I completely disagree that we don't feel accountable for the harm. The harm just has to be explained calmly and rationally, as I said above. And I think it's ridiculous to suggest that only NTs believe in apologizing. A lot of people on the spectrum apologize for stuff we do constantly, almost
obsessively. Some of us may just need some help getting to an understanding of where the harm is, sometimes. That's as much the other person's responsibility as the Aspie's, and approach matters.
I think a lot of posts like the one you attached here are a problem, frankly. They are almost always from an NT point of view, and for all of the talk about lack of empathy in Aspies, NTs are no whizzes at putting themselves in
our shoes, either. They can't be relied on as experts on us. (This isn't meant as NT-bashing. It's just a reality of differences.)