I do; am I mistaken to do so?

Probably not; but IMO the criterion of mistakenness for aliefs (unlike for beliefs) is not being instrumentally useful (rather than not being epistemically accurate). If I'm trying to attract women, alieving that I'm unattractive would be a mistaken alief (though the linked article doesn't use the word “alief”).

I've written before about how aliefs about races can be problematic even when epistemically accurate. (My own aliefs about these things happen to be wrong even epistemically, so I need to be extra careful to compensate for them when I notice them.)