^^Happy to see this.
Uncomfortable to be with happens. A lot.
Your son can put on headphones or whatever gives him privacy, and hang in his room. That way, he doesn’t hear the orders. The hope is that this becomes unsatisfying for the bully.
Or he may want to find another place – in a lounge, student center, coffee house. Nobody wants to feel like their room isn’t completely theirs, but if your son thinks of the room as a place to sleep and store his things, the arrangement may not feel so oppressive.