There have always been assholes and they will always be with us. Assholes make insensitive comments, because they are assholes.

I have a brother-in law who falls into his category. One of the biggest mistakes I ever made in a lifetime filled with mistakes was to go to work for him, a situation that lasted for around 4 years. He would often say or do things when reacting with our clients that would cause them to ask incredulously after he had gone, "why does he say/do things like that?" I would just look askance at the questioner who would then apologetically say, "I know, I know, because he's an asshole."

This is a perfectly acceptable answer and should close the matter.

Devolving to the point where the explanation becomes, "he is obviously a cisnormative, patriarchal, white privileged, microaggressor," makes me glad I am coming down the homestretch of my lifetime and will be dead before the world is smothered in this happy horseshit.