Whoa, I was with that until the huge hit of bigotry at the end. Being queer or polysex is not at all a mental illness.
I do recall one of the arguments against gay marriage being that once gay marriage was allowed, they'd move to something else. "They literally just want to get married" was the common retort to that argument, but lo and behold, it is becoming clearer day by day that the "give them an inch" slippery slope argument may have applied here. (I support gay marriage, FWIW.)
Regardless, everyone has been discriminated against at some point in their lives, but evidently, certain groups handle it differently than others.
[1] https://www.freep.com/story/opinion/columnists/nancy-kaffer/...