I managed to avoid spoilers until the very second we were in the cinema and my friends had been kind enough to put spoilers in cuts and give warnings, only to be spoiled while watching.
You took away the punchline of the jokes, the anticipation of a touching lines and the surprise reveals. If they wanted to read spoilers before watching, they are welcome to but that doesn’t mean everyone does.
I once through my pepsi at a pair of dudes who were seeing some movie a second time but first time for everyone else. Got into a fist fight and thrown out but I took them with me.