if people are being silly I tell them I stop healing if they do that again. you wait for me. period.
if they still do it after me warning them, I may just ask if someone not involved is on my server, and then leave. 'aint nobody got time for that' indeed. I have no time for not enjoying myself.

I'm also one of the healer that absolutely support the tanks that say 'you pull it, you tank it', and if it's agreed upon I'm not healing the puller. they are so badass they don't need it, obviously