They have similar meanings but apply to different groups (at least in the strictest usage though people often use them to mean each other) of people. And who knows that might be part of the case but I think part of it is people liking something racism or any of the isms is something much less than they are. Simply not liking one group for 1 thing or another isn't by itself prejudice or discriminatory. It certainly can be and can be a thin line that is hard to really easily tell sometimes but the difference is profound
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