This suggests a new attack vector on software projects; if I wanted to cripple a competitor, all I would have to do is to first find a real important bug it their software, but then report the bug rudely enough that the developers then want to punish me personally by not fixing the bug. I would then have guaranteed that the bug in my competitor’s software is not fixed, and people will use my software instead.

In other words: Trying to punish rude users by not fixing the bugs they report is like cutting off your nose to spite your face.

This is a super-contrived example, but I could still fix the bug, just not specifically for you, on your schedule. The odds that you'd find an issue that impacts more than the odd crank are so thin that this isn't anywhere near a top concern.

Well then, you fixed my legitimate problem, didn't you? Therefore, my being rude did not excuse you from ignoring it.