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The law does not make it illegal to be rude and there is nothing legally actionable about calling an employee a "dumbass." Insults will only become actionable if they relate to legally protected traits, such as race or religion, in which case a claim for "hostile
work environment" under our civil rights laws may arise.
So, for example, it would be legally actionable to yell racial slurs at an employee because race is a legally protected trait. However, insulting someone's intelligence does not relate to a legally protected trait, and while it may not be the most professional way of dealing with a situation it absolutely does not violate any law.
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