IMHO, the Guild President and Officers set the tone of the group. If there's snotty behaviour and cliques, then the leaders are essentially allowing this to happen. Perhaps you could discuss this with them?? Let them know that you won't be coming back and why.
We had a similar problem in my Guild a few years back. Much to her credit, the President gave a little speech about how everyone is welcome here and all should be made welcome. It helped.
Best of luck. Don't let the snots win!