Me personally? I’ve become much less tolerant of sexist humor. Back in the day, cracking a joke at women’s expense was pretty common when I was a teen. As I’ve matured and become aware to the horrific extent of toxicity and bigotry pervading all tiers of our individualistic society, I’ve come to see how exclusionarly and objectifying that sort of ‘humor’ really is, and I regret it deeply.
Take a look at the Wikipedia page. It really is innocuous, it actually originated as a form of measurement like feet.
https://en.m.wikipedia.org/wiki/Rule_of_thumb
The top comment is using false etymology that was propagated in the 1970s.