If you feel it's fair game to correct the mistakes of others do you, on very rare occassions, get snarky about it?

I let people learn from their mistakes and keep quiet unless they ask for my input. If it's life or death I'll speak up, but I haven't come across that situation yet.

Yes, I've been known to get that way a time or two

I try not to. But if the incorrect assertion is offered with snark—I may meet it on that level. 😄