Texas Transportation Code Sec. 551.103.

(c) Persons operating bicycles on a roadway may ride two abreast. Persons riding two abreast on a laned roadway shall ride in a single lane. Persons riding two abreast may not impede the normal and reasonable flow of traffic on the roadway. Persons may not ride more than two abreast unless they are riding on a part of a roadway set aside for the exclusive operation of bicycles.

When I am driving in a car, and I am slower than the car coming up behind me, I do what I can to let him get past me. It's just a polite thing to do. When I am on a bike I will also do what I can to enable traffic to get past me as quickly and easily as possible.

If a car driver gets pissed off at me, there is no way I am going to win any argument with a car. It's in my best interest to be polite.