Like making jabs at you (which is playful but would grow old fast) or legit throwing shade your way for it?
It's just playful but as you said it grows old fast.
Call it out bruh. Slut shaming is the stupidest fucking thing in the world
"Ha ha you're having sex!!!"
Seriously.
He certainly sleeps around way more than I do, so its kind of ridiculous. He's a good friend though.