How do you deal with trolls?

Not too long ago, I asked a fairly vanilla question. One of the opinions seemed like it might be interesting but was unclear. I asked the author to explain and he immediately launched into insults and factually incorrect statements. After 2 or 3 back and forth exchanges, I ignored him.

What would you have done?

Odd People are Everywhere.
Odd People are Everywhere.
How do you deal with trolls?
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