Do you believe his behaviour has the potential to become problematic? If not, perhaps it's better to leave it. If you do know it will or you're not sure about it then I think at some point you are going to need to broach it with the teacher. If you're not comfortable meeting one-one with the teacher would a conference be better? To be fair and honest I was fortunate to be in a unique situation with the school and as a result only ever had to negotiate the finer points of DS's accommodations. Having said that I rarely spoke with only the teacher, preferring instead to also involve the principal and any other necessary personnel. I found there was less room for emotion and miscommunication and a greater chance of change being implemented. That's what worked for me.