:: "Either I'm not sexist and this behaviour is ok, or I am sexist.. but I can't be because some of my best friends are girls (or whatever). So the behaviour must be ok" ::
In fuzzy logics, the exclusive-or drops away, so you can be both not-sexist (one of my best friends is a girl) and sexist.
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In fuzzy logics, the exclusive-or drops away, so you can be both not-sexist (one of my best friends is a girl) and sexist.