Chris,
I also am a male quilter, belong to three quilt guilds (am on the board of one), and have taught in my LQS. Of course I get odd looks sometimes, but just let it roll off me. MOST quilters are great people (women and men), but as in every field of endeavor there are a few clueless people. My advice to anyone is don't patronize any LQS with poor service and don't join any guild that makes you feel excluded. I know in many places that means no store and no guild, but why make yourself unhappy. Be active in an on-line group (like this one) and try to meet others in your community who quilt (at fairs, shows, etc). Believe me when I say you will find others (including women) who feel the same exclusion that you do at your LQS.