This FA without a doubt had no class. One should never ask those kind of questions, gay or straight content, when there is no indication of any kind of mutual attraction. Being friendly unfortunately in the gay world is often taken as a precursor to desiring sex. And the people often acting this way are the least attractive for sex.
While truly embrassing, particularly in a small RJ, my strategy is to return to my reading/music and avoid conversation with someone lacking manners. This also goes for pesky gay seat mates who have no social skills.