a boy like that is a threat to the teaching enviroment

If he really does have something like OCD, be patient but firm with him. Maybe suggest that if he HAS to do what he’s doing, that he MUST be quiet about it so it doesn’t disturb class. Get him to agree. If he starts and is loud about it, remind him of your deal and that he must be quiet.

If the parents can’t give you more suggestions (assuming OCD), do a search online for coping tips. Different things work for different people, but it can be harder on kids, who may not understand it very well. You’ll just have to try to be patient and see what works.

Edit in response to above: If OCD is truly the issue, you don’t suspend the kid! How stupid is that? How is a child a threat to the teaching environment for that? OCD can be crippling for some people, but they shouldn’t be kicked to the curb for it. Distractions suck in the classroom, but they can be dealt with (even if it’s not a great result). Growing up, didn’t you have kids in your classes that were “trouble-makers” or “class clowns” just because they got into things and distracted other kids?? What a jerk. I always hated intolerant teachers like you. Going over a lesson plan isn’t the only purpose of school!!

In your private conversation with him, try to say something positive about him like: you like his “penmanship”, “artistic abilities” or some other personal trait. Then tell him that you find his behaviour to he very “rude” and “annoying” And say that you expect him to discontinue the interruptions starting today. Always use a kind voice and an encouraging and pleasant smile while you are talking to him. Remember, “it is much easier to catch bees with honey than it is to catch them with vinegar”. Don’t use the “time out” because that only allows him to “show off” before his peers. Dealing with the situation in private, disallows him to win his peers approval. Good Luck!

P.S.

Give him time to change his behaviour but don’t allow it to continue. Try to work with him by asking him to do helpful things for you.