WWhy do guys get rude when turned down?

Let's start out saying I'm a married woman when a man trys hitting on me or flirting I turn them down nicely saying I'm married but they automatically get rude and start saying things like I don't know how someone can desire you because your fat or go after my husband which isn't cool like ik I'm a bigger girl not Def not any 300 pound person

WWhy do guys get rude when turned down?
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