Why are people weird? Mostly because the world is weird. Every living thing behaves weirdly if you think about it too much. That goes for goldendoodles, poodles (those especially), fish, praying mantids, sparrows, hawks that get chased away by sparrows, scary-eyed cats, venus flytraps, people with the username ChrisVulcan...
As for jerks on the internet, good results can sometimes be obtained by treating them like what they think doesn't matter. Monosyllabic responses like "lame" are often best. Sometimes scathing facetious comments (like "Thank you for your patience" to someone who is being impatient) will work, especially if you're in a position to un-friend them or otherwise get rid of them.
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Well, I was on my way to this gay gypsy bar mitzvah for the disabled when I suddenly thought, "Gosh, the Third Reich's a bit rubbish. I think I'll kill the Fuhrer." Who's with me?
Watch Doctor Who!