Not sure what OPs original meaning was, but I think a legitimate statement can be made stating that being queer/polysex (or any other non “standard” sexual identity) comes with a higher probability for mental illness due to discrimination.
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/...