I'll explain it to you, don't think i'm attacking you or anything, just telling you why people and i myself correlate misogyny with homophobia as well. You implied that zhongli is a god therefore stronger than childe, therefore it would fit him more to be a top. People with internalized homophobia see bottoms as the weak side, as the "femenine" side (typical question 'which one is the woman in the relationship?') because they receive in the sexual position, like a woman in a typical heterosexual relationship. Being a bottom is seen as being like a woman, thus making it seem that they are weaker than their partner who is also a man just like them. Woman are weaker than men in the patriarchy system, the more caring, nurturing, cute side, while men are portrayed as the stronger, prideful, harder to break side. Whether it is conscious or unconsciously, it is both misogynistic and homophobic, because again they are setting stereotypes of hetero relationships over homosexual relationships. Being a botton in a mlm relationship has nothing to do with a woman, of course, and yet being a bottom has nothing to do with self strenght either.
To answer your question as to why zhongli is a bottom-- simply, why not? Why couldn't he? What is the reason to not be one? Absolutely none. If you like to see him like that, good. If you don't, then good too. There are no reasons for being a bottom or a top in fiction, these are solely based on the fans preferences/desires/likes. That's all there is.
I hope that answers your doubts a bit more clearly.
Also... not sure what you meant with your last sentence, I'm hoping you just didn't say you are actually misandrous and that you're proud of it?