Pfft, you're not low-brow. You're perfectly rational and intelligent, and as witty as anyone here.
Okay, so I lied a little.
Sometimes you're low-brow.

But only when the situation calls for it. And when the situation calls for it, low-brow humour is both hillarious, and much more effective at getting your point across than a more subtle response.

Isn't part of humour knowing your audience? ^_~
If by quick, you mean 'quick considering that you've thought out and typed up a fifteen to twenty paragraph essay' then perhaps.
