Yeah, that happened once. Asked nicely to see his locked pics. He opened them. As I was looking, it became, shall we say, an inconvenient moment to have RM open on my computer. So I closed the browser and came back later. He'd blocked me. I guess I didn't reply fast enough, and the idea that maybe I couldn't reply at that moment didn't cross his mind.
Bottom line: if he's that fussy and persnickety, I probably don't want to spend time with him.