It's an individual thing I suppose. Gilly walked, others didn't.But what is “spirit of the game”? It’s a nebulous concept. Bairstow was out according to the laws of the game, a written, structured concept.
An example of good sportsmanship is Dohni calling Bell back in 2011 even though he was legitimately run out according to the rules. I supose that is spirit of the game.
If Bairstow was trying in some way to gain an advantage I can understand it. But he wasn't.