If it's worth saying, but not worth its own post (even in Discussion), then it goes here.
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Between the word "beliefs" (which rules out most demographic groups), the word "openly" (which rules out anything you can't easily hide), and the existence of a plausible "anti-X" group (which rules out most multipolar situations), there's not too many possibilities left. The correct answer is the biggest, and most of the other plausible options are subsets of it.
I suppose it could also have been its converse, but you don't hear too much about discrimination cases going that way.