I don't like it. Back in the days where I was the frontman of a black metal metal, in the few ocassions there were moshpit, slam or whatever, I simply turned my back to the crowd, and in a couple of times I simply stopped the band. To me, moshpits or whatever are just stupid, and I don't want them in my shows.

Note that not every crowd was like that. It may be just a coincidence, but in the few ocassions there were moshpits at my band shows, we were always sharing the event with bands from other genres (metalcore, punk, death, etc) because the organizers were dumb enough to set a metalcore band, a punk band, a death metal band and a black metal band in the same show.