Wow, and they had problems with fighting? Sounds like maybe some die hard members of the group take it WAY TOO SERIOUSLY. You're only getting half the story and they can easily blame the new guy for coming in and being the jerk. They're probably the jerks, but won't ever tell you that.

Everybody that I've talked to that rides in a group has been excited and encouraging to me.

If you're still interested in the group, skip the 'meeting' (no groups around here have meetings, they just ride) and go for a ride. Hang out in back. If they get upset that you're not taking your turn at the front, that's their problem...you shouldn't be expected to on your first ride and they shouldn't care.

As for dues: most groups have a website and that costs money. Most organizers take time to plan routes and make phone calls. Many will search out sponsorships for deals at bike shops, and you're paying for the opportunity to benefit from their work in establishing the sponsorships. Some will plan races or events, and your measly contribution goes to that.