How? Guardiola is leaving, he's confirmed that, that is the only issue that affects Bayern. Where he is going, unless he is staying in Germany, is irrelevant really. The talk of him going to City is clearly going to affect City more than Bayern, it's going to get the players talking and trying to find out what is happening and also guarantee a shitload of media speculation about Pellegrini's future that is unhelpful. Even if the players and Pellegrini have been informed of the truth it's still an unwelcome distraction. If a club has leaked it on purpose, then it's almost certainly come from Bayern's side.
As for hating City with an absolute passion, that's a bit odd given you just completely dismissed the club as a contender for anything that Bayern care about. So we're of no concern to you, but you despise us. I thought it was City fans who were bitter about everyone?