To be honest, some of the worst people in the game are the people who've been playing a long time.
Almost every FP I'm in I see people threatening to leave if people don't press the space bar, rage quitting because someone accidentally got aggro (and it turning out to be no big deal), and raging at someone for needing an item, even if they did need it. Often these people have "founder" written above their heads.
It's terrible. I often defend the person, or try to make light of it, only to come in for flak myself. If you continue to treat people like dirt, don't be surprised when they leave and the game that you claim to love goes offline. A little bit of politeness, and respect for other people can go a long way.
Just chill out people.
I think the problem is that we have gone from having bad experiences like this every once and awhile to almost everyday, its gonna take awhile for the community to settle down.