I almost collided with someone at the gym in an effort to bypass an interception by someone who knows my name

I managed to avoid the guy at the gym who calls me out by name to say hello and almost knocked into someone stretching. She said, "watch it" in a harsh tone of voice. It was a mistake, so I don't know why she was so angry and practically yelled at me. I'm sure she will probably tell everyone what happened which is annoying... if she does.

I just hate when that guy calls me out by name. I mean I barely know him, I never wanted to give him my name, but he asked me what my name is. And that was months ago and he won't let it drop. I don't like when people assume we are friends without checking first. I guess I don't mind, but it bothers me. And that caused this whole altercation.