Truth is as impossible to be soiled by any outward touch as the sunbeam.

What is actually the case does not change because it has been handled badly. A fact can be misused, mocked, argued for by unpleasant people or dressed up for a cause, and it remains exactly as true as it was. That matters because one common way of avoiding something is to point at whoever said it. The messenger may be dirty, the message is unaffected.

When you next find yourself dismissing a claim because of who is making it, separate the two. Ask whether the thing is true, and deal with the person as a different question.