There's something about 500.co and it's members which makes me think of them as a totally different cult, very closed group of people, arrogant and somehow not a very good feeling about them. It must be just me.
I don't want to think all 500s participants are like that, but it rubbed me the wrong way. It seemed childish, like, "I'm cool because I can swear, check me out!" I don't think I should let it colour the way I think about all 500s participants, but for some reason, it's a permanent link in my mind whenever 500s is brought up.
Seems like sort of a minor detail though if they do a good job otherwise.
Not sure why you don't have a good impression, and hope that you can get a chance to meet more people from 500S and change your opinion.
Disclosure: my startup was part of the 500S accelerator in 2011.