Why am I so good at bringing out the worst in people?

Because you are basically a bad person?

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I'm sure that's not so. Everyone comes with their own baggage and often how they react has little or nothing to do with us. People are stressed and on edge as it is, it doesn't take much to set them off.

If you are concerned, ask a good friend or relative for an HONEST opinion of your personality. You could also schedule a couple of counseling visits to try and explore this if you think it's a character defect and it's getting in the way of having happy, healthy friendships.

Treat others as you would like to be treated. Good luck.

My guess is that they are already this way. When you first meet someone, especially a shy person, they will not show you all of their characteristics until they get to know you. The bad coming out is probably just who they are.

We all have this talent but most don't use it we try to pick up the good qualities our friends exhibit

The fact that you say Why am I so "good", instead of Why do I might be a clue.