Why does it trigger people, especially women, so bad when older men have sex with young women?

From my experience, some men, and a lot of women seem to handle it really badly if an older man dates or sleeps with a younger woman.

For example I am 52 and have a 22 year old Fwb. This really triggers women and they hate a lot, say lot nonsense and make excuses. Interestingly they tend to support older women with young men.

So what's their deal?

Is it past negative experiences? That's understandable, but it seems more of some kind of insecurity coming from older women and prejudice coming from younger women. Especially considering how hypocritical lot of them are.

For men who hate I can see the same points as for women plus they are jealous of the older man.