1. Do Not Feed the Trolls. Do not reply to their posts.
2. If you must reply, reply to someone else's post in the same thread, especially someone with whom you agree. That way, you can elaborate on why you agree without engaging the troll directly.
3. Otherwise, leave the thread, subforum, forum, or website entirely.
4. Better yet, stay away from threads, subforums, forums, and websites you know to be infested with trolls.
Finally, to paraphrase what George Bernard Shaw said about pigs...
"I learned long ago to never argue with a troll. You'll only get dirty, and besides, the troll likes it."
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No love for Hamas, Hezbollah, Iranian Leadership, Islamic Jihad, other Islamic terrorist groups, OR their supporters and sympathizers.