I think Borzo's posts bring up a good point here - one of the points Primal Zed was making: People usually seem to focus on the negative, or remember their bad experiences with people in-game more often than their neutral or maybe even slightly friendly interactions. If someone really goes out of their way to be nice, that might stick with you, but that sort of reinforces the point - the extreme ends of the behavior spectrum are more noticeable/memorable.
Don't let a few bad apples spoil the bunch. If you focus on negative behavior, you are probably more likely to respond to negative behavior, and that doesn't always help. Sometimes it makes the situation worse, and things can spiral out of control quickly. If you ignore the assholes or report them without directly responding to them, and instead focus on and respond to the people who are nice to you, the community won't only seem better to you, you'll be actively working to improve the community by discouraging the bad while encouraging the good.