I've heard how men talk about women when they think women aren't around/ forget that a woman is there or for some reason decide she doesn't 'count' and it's no way the same as how women talk about men.
We've had young men at university have groups sharing rape fantasies about female students, armed forces groups doing this about female colleagues, in the news yesterday there was a thing about a court case where a man had blackmailed underage girls into sharing explicit content that he put on a subscription service in s Korea, schoolboys in UK circulating stuff about girls they knew with a points system, the list goes on and on and on.
What OP DH is doing is at the mild end of the scale obviously but the place it comes from, in the context of the wider behaviour of men and boys around women and girls, means that a lot of women feel uncomfortable.
Women's behaviour towards men is in no way comparable.
Plus if they are sharing pics of women, even celebs, they probably don't know if they were got consensually, happy to be shared etc. Many female celebs had their cloud storage hacked a few years back. Plenty of content of sites is of underage girls/ filmed rape etc. Coerced. And so on. And in fact when eg the celeb hack thing happened that content was being actively sought with an excuse of, if they didn't want people to see they shouldn't have had the photos/ put them in the cloud etc.
This simplistic oh it's just a bit of fun, women do it to, totally ignores the context and wider perspective on how men behave on the net and in the wider world, too often.
The actions