There can be no reason to object to watching TV in an awning as long as the volume is kept reasonable. After all caravans are hardly the best insulators of sound either. While I don't like excessively noisy neighbors, I have never agreed with the people who seem to demand never to hear a noise from others. I suffered from such a selfish neighbor, where I used to live in Oxfordshire. She lived in the flat below, and objected if I so much as turned the TV on (even if so softly I could not easily hear it while in the same room).
Between those whining about dogs, children and now TVs on caravan sites, you have ask are these people suited to caravaning? Surely they would be better going camping alone up some remote Scottish mountain - oh sorry the noise of the sheep bleating, the sheep poo and the lambs would annoy them there as well.