I completely agree, Sane come to us but for whatever reason he couldn't settle. he was a young kid who had the balls to to say he wanted out/go home (much the same as Boateng). Us as City fans will never boo an ex blue who gave their all for the shirt, and left on honest terms.
I have only ever known us boo 3 ex players
Barton (Scouse twat bully who beats his wife, but shits it from Lescott)
Milner (spotty Yorkshire, scouse wannabe, with a shit haircut)
Cancello (good looking left back who has spent too much time around the fake Ronaldo)