I'm not sure if I should even bother replying to this, but I will anyway. First of all, yes his response was rude but I think you are overreacting. Anyway, the camera problem... are you positive that it never happens when playing solo? My first thought was actually the surface that you use your mouse on. I've had erratic behavior from a laser mouse that didn't like the surface it was on. Also, are you holding down any mouse buttons when it happens (i.e. mouselook)? Also, if you have any macro's that use "TURNORACTION" it can cause the cursor to jump to other windows.

I hope some of this helps.