The reason the CDC is recommending wearing a mask after getting the vaccine is.
1. This first generation of vaccines will most likely just tread covid symptoms, not the transmission of the disease. You can get the vaccine and still get other people sick.
2. There is no way of telling who has had the vaccine from just assholes who done care about the safety of those around them.
Its a public health issue, not a political one. If you don’t like it , guess what , it sucks just as much for us people whom believe in following the rules.