The fundamental question is: Can the truth be sexism?
The fact, which political correctness advocates don't like to hear about, is that both sexes have fundamental behaviour patterns bred into them in the approx. 80'000 years the human race exists.
So is it sexism to speak about those?
And yes, there are exceptions. Just as there are men who like to date men, women who like to date women, men who like to where women clothing, women who ... wait ... you would not be able to spot women wearing mens clothing any more as there is no typical mens clothing any more.
Anyway: they are just that: exceptions.