No, you see, I don't care about vegans, people can eat what they want. Animal ecosystems have nothing to do with that tho, and forcing human morals into the animals' behaviour is detrimental to the environment (i.e. you are forcing the animals behaviour and domesticating it to fit your ideal). So, please, go eat vegan, you are free, but don't come telling me we should seitan to lions because "think of the poor gazelles being eaten". Lions are not evil for eating gazelles, and gazelles are not the good guys because they are the eaten, they are just animals behaving how they evolved to behave.
There also is no sexism in that, you just went "oh, he doesn't like vegans, so he must be one of the people with all that shitty ideas I don't like" and decided to warp what I said as sexist in your mind. If anything it is anti-sexist, because the idea (of which I am explicitly making fun of because I do not agree with it) that all women are weak and all men are all uncontrollable predators, and we, the strong, should keep women separate from men for protection is extremely sexist in multiple ways (it is also why Christians say women should wear long dresses, and Muslims say women should wear a veil, which are both considered sexist).