- The hero(es) have a good reason based on past experiences with said character(s).
- The writer(s) show their bias by having most heroes treat this character like crap.
- To make the character(s) more sympathetic they make them look pathetic to make us feel for them.
Lately I've seen number 2 and 3 used the most. Unless number 1 is written well it has the same effect as the others: it makes the heroes look like jackasses. Their bahavior usually comes across as unnecessarily mean/cruel and makes them look like snobs who think their better than others. This was done with Booster and Ted in CTIC, etc. I've seen this done recently with Jason Todd when it makes no sense. It's usually lazy and is mostly a mean spirited side note in a story.
Instead of having a hero be cool by maturely saying, "I don't agree with what you've done--what I've hear about you--but I'm willing to help." We get, "I don't want you help you, I hate you, even though we've never (or barely) had any panel time together. I'm going to judge you although I don't know you personally and I'll be as petty as I can about it."
That makes me dislike the heroes more than the villains. Don't get me wrong, I still hate out of character jerky behavior between characters that know each other well. This is just another pet peeve.