If the cap fits pompa re you being sexist... but I just pointed out politely that the joke caused offence to me. I would have thought that an appropriate response from a non-sexist person would have been more along the lines of "I'm sorry Jess, i didn't think."
But now you are getting defensive instead of reflecting on my feedback.
Not sexist (just like "not racist") is not something like your height that is a given, it is a process of learning that we all can choose to go through. Both men and women can have blind spots about stuff that has been normalised, like sexist jokes, sexist child rearing, sexist advertising and so on.
Having been a victim of domestic violence, including death threats, this one is not difficult for me to "get".