I would like to share my experience with you.
Against my advise, my husband coached our teen aspie 14yr old in soccer for the first time this year. Dad wanted to be more of a support and more involved in his sons activities. Guess what, the committee has already sacked the coach. No surprise to me, I knew my sons behaviour would get worse when Dad was the coach. He swore at team mates telling them they were "f----- hopeless", kept swearing and putting himself down in front of parents. As soon as my sons team mates saw the lack of respect he had for his father, all discipline broke down. It was an absolute disaster. Guess what, new coach for the first time, not a peep out of our son and suddenly he has self control. He regrets his behaviour very much now because he hates that feeling of uncertainty.
The things we do for our kids!