Personally I think that Sam won't directly face much if any discrimination from players. He'll for sure get some crap from ignorant fans, and from the way it sounds he seems to understand and accept that, I hope for his sake he's a big enough person.
What I do think may become an issue is a more indirect, circumstantial type of bigotry on the field. In a heated atmosphere I can see players in a huddle not maliciously, but ignorantly making comments like "don't let that F@#$%t get by you", or "you just let a @$#% just **** all over you"...etc. I would bet those are things that have been said for years in huddles, just look at some of the practices that have come out about locker room cultures. I think it will be interesting to see how all facets of this situation play out.