When most relationships are hetero, just calling out hetero pairing as a proxy is.. perfectly fair. That's not some kind of secret exclusionary dogwhistle just to use common language.
If parents are almost always a man and a woman and you say "kids with a mom and a dad"... you're just using the English language.
Dogpiling someone and attempting to shame them for "a lack of inclusivity" isn't some kind of meaningful attack, it's just a failure to be a useful communicator.