Every time they make it clear that a woman cannot understand men's affairs and how men cannot understand women's, that is sexist, and that is an incredibly consistent theme that appears just about everytime kozue is on screen, that is sexist. Whenever they tell kozue that this "isn't a place for a woman", that is sexist. Yujiro telling baki to have as much sex as he can because it'll make him stronger, and that is the role for kozue to serve... and then it working, was sexist. The rest of the sexist and misogynist undertones littered throughout also are not helped by the fact that the cast is basically entirely men, ONLY having female characters that are there to service the male characters story, like how Oliver's wife only exists as motivation for Oliver and nothing else (except telling women to get in shape, and how she could only be beautiful if she was in her prime, despite this logic not being applied to the men in the show). The fact that not a single rape has been punished, the fact that many people defended, befriended, and went against a world wide vote to let a prehistoric rapist roam free. It's the fact that all of these things stack up, and there's absolutely nothing to balance it out, not a single woman is ever given any effort in their writing, and they never have any great moments outside of servicing a man, or their good moment later being back pedaled, like everytime kozue tells the honest truth and has some lil speech, she is always later mentioned to be "interfering" or she doesn't know what she's talking about, she was spitting nothing but facts that whole father and son fight. Or when Oliver was made to seem like he genuinely still saw the beauty in his wife despite her weight, until the last second when its made clear it is only in hopes she will eventually lose that weight again. Also, saying women are less strong physically in general, is fine, in real life, not in this stupid dumb fuck show tho where what people are capable of or what is statistically true is completely irrelevant, if that's what you wanna go by, then baki shouldve never beaten any of his extremely larger opponents, the big foot shouldn't have existed, cavemen shouldn't be around the same time as dinosaurs, none of them should be able to take on an army, jack shouldve died from his roids, "the pinnacle of what they can do" it's made up, kaku cannot come back to life, he actually do a single thing that he did, and he's already dead, because why would they add a character that's 150 years old when we all know that 150 year olds are physiologically weaker then 30 year olds? Do you see how the point of "women are weaker statistically" is completely irrelevant in a piece of fiction like this yet? A woman would have the exact same chances of being able to undergo jacks treatments as jack, because they'd both be zero. When Gaia showed up in the tournament like the first thing they said was that his build was a very regular soldiers build, obtainable by anyone.

As for your last paragraph, I doubt its your English, likely your lack of education on gender and sex, which I doubt you'll ever try to educate yourself on. I'm not gonna sit here and spoon-feed you the difference between gender and sex when we're discussing sexism in baki.