Heck, I wouldn't even care even if he/she wasted 5 mins or so blabbering about his political ideology, if his/hers advice on, let's say, JS programming, would be as valuable as Douglas Corckford's! Imho, it would be even acceptable if he/she would crack a few very politically incorrect jokes during the social event smalltalks if the jokes had good enough humor to compensate for their content.
Let's grow some thicker skin for fuck's sake! MDs, physicists, chemists etc. are all pretty comfortable with even cracking bad sex jokes at a party or conference from time to time and they get away with it pretty well.
Or maybe it's the fact that 90% of what most software developers is so meaningless and useless, especially those that have the time to speak at conferences and "evangelize", that they need to find meaning in some other shit and they gravitate to this uber-PC crap... Even a banning everyone which titles himself "developer evangelist" from speaking at a conference could probably raise the average talk quality for that event, event if that would a bit too un-PC even for my taste ...imagine the emotional damage inflicted by such a need for personal rebranding in order to still be able to attend.