If you have grown up in the hearing world, as a hearing person, you would know that it is rude to interrupt someone when they are speaking. Deaf and HoH people do this all the time, not out of disrespect, but because they can't hear the break in a conversation. I have problems with this to no end when I am in work meetings and I understand that it can be very frustrating for my coworkers.
There may be a way deaf have learned to detect when there is a break in the conversation, but at this time, I do not know how to detect it.
Certainly, people could be less rude about correcting people on this. In fact, people could be less rude in general, but I don't think we are going to solve that problem any time soon.