Like everybody else, through life I’ve had to deal with a number of mean folks. Since then, they get improved billing as toxic people. It works out about the same. Some have been family who professed great love for me. Others passed as friends, and I had the privilege of working with some.
I wish I had been born knowing some of the stuff I’ve learned along the way. For one, pay attention to your gut. If you have a bad feeling about someone, be cautious. We have been trained to give people the benefit of the doubt. There’s a reason people to make you uneasy. Animals don’t ignore their intuition. Neither should we. It is hard-wired into our DNA.
Protect yourself. Anyone can make a mistake once. Repeated behavior is a habit, unlikely to change. Move on.