17. Make passive-aggressive comments
Whether you’re conversing with a coworker or arguing with your spouse, being passive-aggressive is just as bad as being outwardly aggressive. Even if you think your aggression is subtle, “people have a high level of emotional intelligence and they know when the person in front of them is sincere and friendly [vs.] the opposite,” says Maryanne Parker, founder of etiquette company Manor of Manners.
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