Are they really negative aspects of the opposite sex? Is gay male cattiness and bitchiness an aspect of femininity? I think not.
Many men, once they come out, tend to come out with a vengeance. They take their newfound freedom of expression to the extreme. Outward show, and flamboyance can be part of of that--and it's just a short step from that to Bette Davis and Joan Crawford.
But just as your brother did, many people settle back into a pattern of behaviour that is more typical for them.
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--James