I remember comedian Michael McIntyre made a joke about this before when someone says their name and you mishear them.
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Michael: "Hello, what's your name?"
Person: "My name is (Zizazibar)"
Michael: "Sorry?"
Person: "(Zizazibar)"
Michael: "Sorry?"
Person: "(Zizazibar)"
Michael: "Sorry?"
- At this point, you basically have to go with whatever you heard -
Person: "(Zizazibar)"
Michael: "...Nice to meet you, Zizazibar".
Ha! I'm usually (read: always) on the other side of the this. My name's pretty rare, especially round these parts, and people never get it right, no matter how many times I repeat it. Back in school I'd often have to show ID to teachers, because they thought I was joking around, last year the vet wrote an entirely different (more common) name on my cats' passport thingie, even though I spelled it out to her and a few weeks ago even the bloody cops wrote it down wrong, even though they copied it from my ID card. It's incredibly frustrating...but at least my name's not Michael

(Not that there's anything wrong with that; I'm just not a 'Michael'.)
Anyway, that's just some personal off topic venting. I'd say it's got more to do with frustration and lack of patience, as mentioned before, perhaps aggravated by personal anxieties.
Maybe it's because of my name thing, but I generally like those interactions. Earlier this year I met some foreign fellows on the train (no idea where they came from; doesn't matter) who had gotten on the wrong one and it was actually quite fun to guide them along, trying to explain which one to get, which platform to go to, what time and all that, partly because we didn't have any shared languages among us.
Another thing to keep in mind is that we all have the capacity to be intelligible to others. We all make mistakes, in language or otherwise. When put in chronological order, English is the 4th language I learned, so I'm sure I write down way more errors than I'll ever be able to discern. Other people might be dyslexic for example. There are quite a few mistakes in your own posts too. Yet we look past that and concentrate on the message for the sake of communication. Patience and mutual understanding are your friends; use them.