All the things you mention would certainly irritate me if my husband behaved like this.
In your place, I would take your partner up on this behaviour, as and when it occurs if you and he are alone that is. Explain that you find it hurtful and demeaning.
A comment such as "Do these actually work" while pointing to his ears or yours because you misheard him, is both juvenile and insulting. However, before telling him so, you might just want to consider whether your hearing is deteriorating. If it is not, then you have the perfect answer the next time, he is so rude. You tell him you have consulted the doctor and your hearing is just fine, so will he please stop mumbling?
Is the relationship so good that you are prepared to put up with his rudeness?
If not, you either have to get him to change, or you need to leave fairly soon. The longer you remain the harder it will be to either get him to see your point of view about this, or to leave him.