Can you picket picketers?

Tweet

I was just reading about Fred Phelps and his whole lot and what he believes and stuff. Crazy man, even people of his own religion don't like him. Anyway, they picket tons of stuff and basically try to spread hate and say they are spreading their god's word or whatever. So I'm wondering if anyone has every picketed picketers? I mean these people go to military funerals and say "Thank god for dead soldiers" and stuff. Couldn't there be another crowd picketing these people with signs like "God hates haters", or "you're old! you smell! Die and go to hell!" Ok so the last one is pretty mean and hateful itself, but still... Or maybe just quietly and respectfully holding signs up supporting the grieving families and signs in memory of their dead loved ones to thank them and show support even when there are hateful people around? Has there every been an instance where people have picketed a group of picketers?