What do you think about when omegaverse yaoi mangas refer to one partner being the "mom"?

I'm a lesbian who's always been in lesbian spaces since I was a little kid, and it's not at all uncommon for one partner (esp butches) to refer to themselves with masculine titles in the relationship. When I used to have a girlfriend I was addressed as her "boyfriend" even though I don't identify as male - it's just the title that felt the most comfortable for me. Similarly, I've known lesbian couples who have children and one of the parents referring to herself as the "dad" and her kids addressing her as such. So I'm very used to the idea of one person in a same-sex relationship choosing to use titles that don't "fit" their gender. So when I started reading omegaverse I never even batted an eye at the omega men being referred to as "wives" or "moms", and so was very shocked when I went into the comment sections on these manga to find that it made a lot of people uncomfortable or thinking that it's weird to refer to a man with a feminine title. I'm curious what other people think and their reasons for why??