Why is being a "simp" a bad thing?

In my experience, guys who get called simps are very sweet and just respectful of women versus the guys who call them simps who are more often than not very disrespectful and unpleasant in general. Hence why I see nothing wrong with a man being a "simp". What is your definition of a simp and is it a negative thing in your opinion?
Why is being a "simp" a bad thing?
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