Is there anyway to stop people from killing you

[Daddiooo]

I have run into a few a**holes that are running around and just killing people. They are low levels(27) and are able to kill higher levels so they must have hacked. Is the only way to avoid these people to just exit and then find another game? Or is there a trick that I can do to avoid them (besides making private games)?

Thanks for the help......

Dad-Barb
Dave