You can handle this situation with a little humorous reply to him:
- Hey buddy, No need to apologize. I will buy you your favorite drink and lunch if you don't apologize to me any more while I am working.
- My friend, I will buy you a ticket to your favorite concert or sport team gamesgame if you don't apologize to me any more for this same meeting thingconsulting event. I am not bothered with the noise.
Don't try to make your reply look like a strong criticism of him when you know for sure that he honestly simply wants to apologize for the noise.
It could be that somehow, he lacks some people skills or soft skills to understand that his repetitive actions may bother some people. I don't want to use say that he is on the spectrum because there is not enough info to say that.
Anyway, it's just a good idea to reply to him in a nice and humorous way if possible because he means no harm in his apology (even though it may bother some people).
If you are consistent on your message, he will get it eventually.