I normally don't mind other people watching me play games. In fact, since I grew up with three younger brothers, I've got so used to it that I barely notice it anymore if, say, my girlfriend or mates are doing it. The only pet peeve I have is if I'm playing an RPG with talking cutscenes I hate, hate, other people talking over it; so usually I enforce a no speaky rule. Unless its Eternal Sonata. Then me and my girlfriend just sit there mocking it Unskippable style.