I didn't see anyone denying it but just because it was like that in the 1960's doesn't mean it has to be like that today. Compare sexism with racism...none of the "minority races" got as much screen time or were major characters, does that mean modern Trek should be the same?
That's still a false comparison. It's already been pointed out several times (Some of those times where by women, I might add.) that sexy and sexism are not the same thing.
The point here is that Star Trek has always been sexy. It has not always been sexist.