I think the person covering their mouth should finish their yawn or cough before attempting to speak.
Seriously though, my father does this all the time. I give up correcting him, but my brother and sisters always jump right in and correct him. This is a form of audism. It's not malicious, it's simply my father not taking into consideration my need to speech read. The reason this is audism is because I have needed to speech read my entire life and he still does not get it despite having been informed many many times. This reflects our society's habits of doing things that reduces our ability to participate.
And, I think we can all agree that excluding someone from general society whether intentional or not is wrong.
As to your question, no, it's not reverse autism. The reason is because the hearing person is not being excluded from society at large. It is simply one deaf person being rude to a hearing person.
If you look at my example of my father covering his mouth, you might think that this is my father being rude. The reason he is not being rude is because this is a socially normal/acceptable behavior. What makes this
audism is the fact that he is
aware of my communication needs (and
can easily accommodate it) yet still blocks his mouth with his hands (even though the blocking was unintentional).