Good topic!
My red flags include Abusive language, Alcoholism, Arrogance, Bigotry, Bullying, Drug addiction, Gun collection, poor Hygiene, Hypocrisy, Irresponsibility, Knife collection, Laziness, Lying, "Mooching", Nazi obsession, Obesity, Porn obsession, Prison record, Rage issues, Schizophrenia, Tattoos, Thievery, Tobacco use, Violence obsession, and constant Whining.
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No love for Hamas, Hezbollah, Iranian Leadership, Islamic Jihad, other Islamic terrorist groups, OR their supporters and sympathizers.