You know who grunts when they lift? Everyone who is seriously overloading their muscles to get stronger and/or bigger. If you want to chat with your friends, go to a coffee shop and stop hogging the damn hack squat machine.

That being said...there is a difference between, "I'm lifting really heavy for myself" and "I'm an attention-seeking douche bag who wants everyone within 50 meters to know that I've set a new PR." It's roughly the volume and tone difference between having a real orgasm and a porn orgasm... a friend explained to me.