why are some people so rude and inconsiderate?

went to a store with my dad earlier. it was one of those places that have forklifts and other big, loud things going on. because of this i had my earbuds in, at a low volume, just so i wouldn't get overstimmed or anything. mind you, i could still hear my dad (he was aware of this) and other people talking. i wasn't like, oblivious to my surroundings. but some people don't seem to get that.
some older guy started talking with my dad, started off not too bad. but eventually he asked if i kept my earbuds in a lot, which my dad didn't lie about and said yes. then he followed up with "does it not piss you off that she doesn't listen to you?". i wanted to say something, but i'm not good with confrontation, so i just kept my mouth shut.
but like, do some people not consider that people might be doing something for a reason? without my earbuds i could've easily had a meltdown in there, i wasn't just being rude for no reason.