They weren’t happy when the Russos did a post-Endgame interview with Deadline talking about how “Representation is really important” to them, and since they did four MCU films, “we wanted a gay character somewhere in them.”
It was a very casual mention, the kind of thing you could miss if you weren’t listening closely.
The fact that the man’s sexuality was treated as an afterthought was applauded by some, but seen as disappointing by others.