Depends on the dynamic. You should say something rather than an empty state. Joking say to one of them what you wrote here, “what the hell man, you all are huge?!?” Then see what the feedback is.
I enjoy showing off but I don’t enjoy being ogled if that makes sense. If someone is struck by my size, I like them staring and thinking “holy fuck look at the size of that thing.” But if someone is drooling thinking “I want to suck that,” it makes me uncomfortable and I remove myself from the situation.