True, that. It's entirely possible that you unwittingly broke some rule of their forum culture, which sets some people off. Or perhaps your request didn't reflect the efforts you had made in solving the problem, giving them the impression you were just looking for a drive-by-solution.
Some people are just jerks, in general.

Like the person who used so much air-freshener in the bathroom just now that it's polluting my cube half way across the office.