That brings up an element, Kevin, that I hadn't thought about. Thanks.

If we are supposed to be colour blind, as some say, does it follow that we are not supposed to notice whether the one we are speaking with is male or female?

I submit that making generalities, especially derogatory ones, about the sex of the person is what would create the problem.

If I say, "You as a man of course will not understand what I mean when I say xxxxx", that is sexist.

When I say, "You, as a man, may have had a different experience from mine as a woman", that is not sexist but the recognition of sex.