Should we discard achievements made by unlikable people?

[notimportant1234]

This is a problem i allways hated. If for an example I advocate for gender equality and in a rainy day I decide to go to a prostitute people will dismiss all my claims because we all know that if you are a hyprocite than all your statements must by false.
But the response I like the most "If he couldn't do it why should I?", because if for some reason(psychopathy for example) I can't stop killing people why shouldn't everyone kill people.

I wouldnt see paying money for sex as being hypocritical for a person who advocates gender equality.

Me neither , it was a generalisation. The point is that people most of the time call on hypocrisy and imorality to dismiss statements.