How do you all react to an insult?

I've never received an insult to my face, although - of course, like everyone else - I have been attacked online for no reason. Normally, I'm not bothered and see no point in wasting my time on them. I prefer to ignore the insulter(s) and exit the Internet. However, on extremely bad days, I sometimes sit there and feel tempted to sling an insult back at them. It's terrible - the hot, sudden pain that lances through my chest as I stare at the glaring comment on my screen. But I usually murmur a blessing over them, slowly close my computer, and find something else to do.

How do you react when someone insults you - whether it's online or face-to-face (not looking for advice - just curious about what you would do)?