My guild also has it's cliques, but there are also many other talented quilters who are friendly and helpful and make the guild fun. Don't let a few people sour your opinion of a larger group. We've actually had a few of the snobs try to get involved in our activities because we're doing fun and interesting things, and that's what being a guild member is about.
Also, remember, it's not just quilt guilds who have rude people. It's just in some people's nature. A number of years ago my husband and I visited my parent's church, but because my parents were in the choir, we went into the sanctuary on our own and sat down. A few minutes later I felt a tap on my shoulder. Turning around, I saw an elderly couple sitting behind me. The wife leaned forward and said, "I just wanted you to know that y'all are sitting in our place, but that's OK for this week." How Christian!