What should I do if I meet a colleague who has a conversation?

I often have a sentence. Can't he even see your expression? Don't pay too much attention to him, just do your own thing. It's really annoying to this kind of person. Every time I listen to them, my mind will buzz.-I feel dizzy. I'm embarrassed to ignore him, and I can't do anything if I want to ignore him. I still think it's more important to do my own thing. So, I can avoid him if I can escape, and I don't have to pay too much attention to him. I can use some small reasons to say where I want to go, or. Concentrate on doing your own thing, ``.