Absolutely astonishing.
I'm in my 50s.
I am friend of DS and see limited updates from DD. [I don't see her status updates, but do see her photos and notes.]
I have FB friends in many countries, and quite a few teenager "friends", usually friends of DS/DD or other family.
Something appears in my news feed, I'll either engage with it or not.
If you don't want me to engage with it (I probably won't anyway, as I see a lot of stuff) don't stick it on my wall.
"You shouldn't be friends with your kids/14 year olds" - anyone who said that sort of thing... who died and put you in charge?
The OP's post said
DD is currently away in London for the week and this morning posted a status on facebook about her breakfast saying it was lovely and the chefs can cook.
DP then posted a reply saying "well that's generally what chefs do". A number of people have "liked" DPs reply which to me is a little like group piss-taking.
or rather more like people agreeing with him and being amused at the way he's phrased it.
He's always doing this though and we've talked about it before
The OP and her partner or the OP, DD, and partner?
If DD doesn't want partner to comment on her status updates, she can deal with it.
The OP is being precious.