fight with gf, judgement on my actions?

[Andrew Karpinski]

OK.

So my girlfriend and I had one of those nonsense fights. She says (in response to something I said)
"thats because you clearly have no idea what you're talking about"
I say
"That may be so, but you CLEARLY started this fight"
she says
"Well you should CLEARLY shut the [censored] up"

I figure a line has been crossed and I need to do something here. What do I do next OOT?

(btw this has already happened, I will post my line of action after responses)