As an introvert, what I like about this approach is that it does not close any doors, it just opens a discussion. Ofttimes that discussion is rapidly helpful. When it is not—when the manager is a bully, or oblivious—I still have the option to be more blunt. It's a diplomatic first foray into tricky topics.
Whatever works for you is great. I’d just suggest you be careful that you don’t first establish yourself as somebody who will tolerate bullying. Once you’ve laid the groundwork for that, undoing it can be much harder than just avoiding it in the first place.
