My personal opinion - It depends on a great number of factors. Generally, I frown upon it (Not that my opinion matters)- although in certain circumstances it's more understandable than others. (1) low/bottom BR for the match, just trying to play the game to spade a vehicle and get revenge bombed? Angry noises. Especially if there was a top-BR heavy tank in their capture circle less than 500 meters away. (2) Top BR tank in a really campy/hard-to-counter spot? To get revenge bombed is a setback, but it's at least kind of understandable, as I was in a dangerous tank for their team, and not something their team would have easily fought against.