What's the point anyway?

Some FOSS conferences are very fun and inspiring, so instead of boycotting them all perhaps you should look for opportunities to attend one that is recommended by someone you respect. I've only been to 2 big conferences, SCALE and SF LinuxExpo, so my experience is much narrower than Jon's, but neither one suffered from tasteless offensive presenters or drunken attendees. SCALE in particular is a great conference, well run by volunteer organizers, and well worth attending; every year it has been the must-go conference for me.
http://www.socallinuxexpo.org