You know what really bugs me? People who complain about how ignorant a group of people are, yet their very own statement is a statement of ignorance.
Sure, people can be ignorant... but when someone make the statement, "Christians are ignorant", that person implies that all Christians are ignorant (even if that person didn't mean it). That person also comes off as ignorant, bigoted, and/or incapable of using logic.
To overhear people say that sucks, but to hear someone write it off by saying, "Oh, I didn't mean for YOU to hear that" doesn't justify anything. No apology? Or is that a sad attempt at one? That's another thing that pisses me off. When someone wrongs you, it is easier if you are reassured that they will try to tone down a bit and attempt to make up for their mistake. For some people, a spoken apology is enough. For others, they expect a promise or for the offender to make it up somehow. So if the offender does nothing at all? That's called being a jerk... but you can also substitute some more offensive synonyms in there as well.
I understand that people may be skeptical of Christianity or may be atheists. I don't find anything wrong with that, but I do find something wrong with people who find it funny to make a negative, blanket statement about all Christians. Those who are willing to discuss beliefs, whether disagreeing or agreeing, are okay, but once they cross the line... that just gets on my nerves. There's nothing intelligent about a person who haphazardly throws out jokes about Christians. Of course, there are times where you can make those jokes with friends where they know you do not have anything you or your beliefs, but they just found a joke that was funny... though, delivery and timing of a joke is important if it is meant to be funny.
There are limits to my tolerance and those ignorant statements definitely crosses the line.
People deserve respect... but if you can't respect others, what makes you think other people will want to respect you?