I've recognized many users that tend to be neglecting others, or are very inappropriate, especially when it comes to jokes and other naive things. Of course though I don't like to encourage them or even add fuel to the fire, so I tone them out and move on. It's no use if you keep trying to let them know, people aren't as sensitive and even if they are, they are laughed at for being so selfish or trying to defend themselves. Everyone has a flaw, so it's best to just keep to yourself, because you can't change a person on a game based upon their demeanor.
I also can't tolerate if people pretend and I don't take kindly to those who would manipulate anothers' mind, as if they want to respect you and be truthful but instead they try to knock you on your feet and are very possessed with their surroundings and would lash out at you. Be strong and bold and ignore those who try to slowy ou down.