If you don't want to be prop killed. GET THE FUCK AWAY FROM THE PEOPLE THROWING PROPS.....also try to ask nicely for the person not to prop kill you. I have never once been asked nicely to stop prop killing someone. I have been ordered to by admins, I have been yelled at, and I have been disrespected. SO until it becomes a rule, or you start asking like a decent human being, people probably won't stop.
Also, why not let people have their fun? It does not affect the actual game in any way, calm down and have fun. Trust me I have to remind myself of this too sometimes.