I'm not sure that my social skills is good enough for you to imitiate, but I would do one of the following. I could tell such a person that I'm busy and have n

I'm not sure that my social skills is good enough for you to imitiate, but I would do one of the following. I could tell such a person that I'm busy and have no time for a conversation. Without explaining him what his personal traits bothers me. I would say something like "I need to work now, have no time to chat, sorry, maybe next time". If it is unacceptable for some reason, I would tell it without words, by playing a role of busy person with his mind on something else, honestly trying to be nice but having no spare mental capacity to do it good. At the same time I'll try to aviod to show him any emotion, because it may reinforce his behaviour. Just imagine that there are a lot of things going on your mind, you are thinking right now some complex thoughts that are not related to the conversation with this guy, and the conversation doesn't really prevent you from thinking, despite you are trying (not very hard) to be nice. A few months of such a one way conversations and he will find something else to teach.