They're already wet and miserable, I'd suggest they've very likely figured that out themselves.
My question is what exactly you think you'd be achieving by "taking the piss" out of them for it.
This is a hobby that requires active, willing, cheerful participation in the shared make-believe game that we're playing.
Do you
want miserable people to stay on site just so that you can shoot at them?
After being taunted and harangued into staying, do you think they'll be minded to take hits from you?
If they don't, what follows? You kick them off site?
Surely you know how quickly grumpiness can spiral downwards?
^^^ this thread.
Maybe repeat it a third time, with more feeling.