Hi...I'm sure this is not at all an issue for you, but wanted to just throw it out there. My daughter used to love art, but after the strep and severe pandas episode we are now left with ocd. Her ocd is a fear of swallowing chemicals and things like glue and paint. Art class is her hardest and most stressful thing to do now and she seriously used to love it. Just wanted to throw that out there, but I think our situation is more unique.
If I were a stay at home mom I for sure would keep her home from it b/c it's not a big deal, but honestly I would schedule something else during that time (therapist apt., an early morning activity, etc.) so that she didn't think she was going/giving in to the ocd. (does that make sense?) I personally think (and this is just my opinion) that if you have him not go because of the teacher then you will have MAJOR problems down the road whenever he is with a bad/stressed out teacher. He might think he should not have to go, when unfortunately is it something all students will probably have to come across sometime, especially in middle school when they have about 7 teachers...most likely one of them will have a non pleasant personality. I wish there were not bad teachers, but there are (just like there are horrible doctors).
I would try to set up some kind of plan for him (do the art work at home over the weekend and miss the art class)...or have something else to do that he can do well during the time that he starts to be disruptive. My daughter's art class is always able to draw pictures when they finish early, or is there something he can play with like puddy to keep him occupied better. (an autistic child in my daughter's school used this and it was helpful for my daughter last year when she returned from being homebound due to pandas.