I think each this situation should be resolved by the trans boyfriend in question, not a group of strangers. It doesn't look good to me, and I wouldn't want to be in such a relationship (and neither I'd want to date a lesbian that's not attracted to cis men), but if someone else is okay with that, I cannot revoke their agreement on their behalf and proclaim that their relationship is actually an act of bigotry. Also, I support people's right to date outside of their preference.