So.... your son is afraid that his teacher won't think hes a Biden supporter? Where did he get that idea from? I would have a long talk with his teacher and ask them why they think its appropriate to discuss their politics in your sons class. Then I would shame the teacher the same way your son feels/felt shamed. Personally, I don't even think that's an appropriate question for the teacher to even ask in regards to your son if he wore a mask. I get your just venting, but I'm a different breed. I don't give a shit, even if it made my kids embarrassed, but I would start making waves. Your son will thank you for it later when hes older. Consider it a lesson in tough love. As a parent I empathize with you when you see your children cry when they want to fit in and shit, but I would ask him if he would rather be a leader or a follower, and if he wants to be a leader, I would continue doing what you're doing and lead by example and be that guy standing alone on the island. Eventually he will put 2 and 2 together. If he prefers to be a follower, then let him go be one and support his decision and treat him like a follower. I'll leave that up to your own interpretation. Don't let your son end up like that one piece of shit kid that turned his dad into the FBI for going to the capital.