I'm sorry you were treated that way. I agree with others who posted about cliques and people being set in their ways, etc. If you considered going back to the guild, I would encourage you to take one of the committee chair positions. That way, they'd HAVE to notice and acknowledge you. Also, if you continue to show your work, I think they might take your more seriously. Have you considered becoming part of a friendship group, which is usually a smaller off-shoot of the bigger guild? That would give you a chance to meet and get to know fellow quilters in a smaller setting and they could get to know you too.
Whatever you do, persevere! Keep creating your great quilts. Show us your beautiful projects! We'll appreciate your talent. We'll be your cheerleaders.
Just my thoughts - - -
Jane