Are you seriously correlating asking someone if they like girls with slavery?...
Honestly, i wouldnt want someone on my team who cannot even answer a simple question with out making a circus out of it. If they are that sensitive what are they going to do on the field when someone calls them a derogatory gay name? Cry and tell the ref? I hate to break it too you but there is a lot of trash talk on the field, nothing is offlimits. Cant have these mental twinkies freak out over words, blowing the play because their feelings are hurt.
Teams wanna know what they are getting, i dont blame them for asking questions. This is a team sport, you dont piss off the whole locker room to make one player happy.
This will become an issue when a player is cut/not drafted because they are gay (thats discrimination, not asking a simple question), currently i see nothing wrong because nothing has happened.