When I just started playing (and didn't have a clue) it would totally mess with my head if someone was 'effing and blinding' at me, or even to someone else at the table. I would completely loose concentration and all I could think about was 'what actually happened here?'. My chips were as gone as gone.
Now, I love it for two reasons ..
i) Humour: I laugh my head off imagining this idiot, in a room on his own, going berzerk at his computer (picture Ben Stiller in that Friends episode).
ii) Profit: It's a sure sign of a weak player and I'll be eyeing up their chips.