Should you avoid anyone who associates with someone who is your enemy?

I had a series of run-ins with a person who is very bad news. I was told by several higher ups to put space between me and her so that other people would not associate us. I then meet someone who insists on bringing her up in relation to me... to the point that I had to tell him a few times to stop... and had to walk out of two places after she made a scene.

When she makes the scene she makes sure the guy isn't there. I'm very mature and classy about brushing her off, but it's to a point that I've now asked security to step in, etc. She's not welcome to communicate with me.

The guy seems to be on her "side" with this and yet he keeps trying to be in communication with me. I'm keeping space now bc I don't trust him.

What do you guys think?

TRUE!
FALSE!
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Should you avoid anyone who associates with someone who is your enemy?
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