When playing singles with my room-mate I audibly laugh out loud if she can't get to a shot I hit. I don't laugh if I hit a clean ripped winner but if she runs her a** off and can't get to it I find it funny so I laugh. She says I am being a bad sport and get's really pissed at me. She asked me not to do it but I do anyway because I think she is just being too sensitive. What do you all think?