Since this is a pattern of behavior and not just someone having a bad day, I think you are very wise to be thinking as you do about this person. Although I am not in your shoes and wouldn't want to trespass on the uniqueness of your experience, I suffer from anxiety and depression and have had to cut certain people out of my for the sake of my mental health.

Some people can become toxic through illness or upbringing or just plain ill will, but whatever the cause, being around such people is not very helpful. I am sorry that your "friend" was lacking in empathy, understanding and tact. Sometimes it takes a while to find out what bad habits people have since in the beginning, efforts are usually made to put on a good face.

Sadly when this "honeymoon phase" of a friendship wanes, peoples real strengths and weaknesses manifest themselves. I'm sorry you do not have a more kindly and compassionate friend, but I think your feelings are completely understandable.