Adding my voice (thanks @Maireas for starting this thread)
There have been countless awful, offensive, insulting threads about older people this last few days alone. I've been on most of them and I know the people posting here have too.
It is relentless at the moment. It's tired (and usually untrue) stereotypes and it makes me sick to my stomach to think that there are actually people (mothers of children if the demographic is to be believed) who really think like this about anyone over the age of about 40.
Nobody on here can have a whinge about their neighbours without it being necessary to say they're old, and fill the post with vile ageist language. Often misogynistic too.
I reported a post from someone a few days ago who was calling an older woman all the names under the sun. The post is still there.
The swimming pool thread yesterday plummeted very quickly into any older man anywhere near children is a sex fiend and paedophile (despite the less interesting truth being that your child's 17 year old cousin is statistically about 80% more likely to try and sexually assault your son/daughter)
Ageism is the last -ism seemingly accepted on MN. It used to be dealt with, posts used to be deleted. Now the people reporting them get a telling off.