My therapist definitely laughs sometimes when I put things in unique ways, and I'm not always trying to be funny but I do use words in interesting patterns and am pretty articulate in general.

I don't experience it as laughing at me and not necessarily laughing with me (although that happens too), but as a humorous response to something I say. I like that he responds with humor to something not necessarily intended as humorous. It makes therapy more like delight and play rather than always being so humorously serious all the time.

You can't really control other people's honest reactions to you. If you want them to stop, you can ask, but for me it's been more useful to allow people to say what they feel rather than try to script their reactions to me-- as long as it's not abusive or otherwise breaking some kind of boundary for me. It promotes greater connection and I myself appreciate having more rather than less freedom in my relationships with others.