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I just received Glare reducers on Server Fault when I tried it on Stack Overflow
Update: Got it on 8 more sites now. But not on SO.
Fix is in place.
Due to bug, this was being awarded on every single site the user has an account, if they have dark mode set on SO. Hats awarded on non-SO sites have been removed.
This hat can only be awarded on SO or on one of the non-English SO sites.
Not an official answer, but from what I've seen Dark Mode and High Contrast are only available on Stack Overflow. It seems that after enabling one of those settings, the hat will be awarded (annoyingly slowly) on all the sites you have accounts on.