A lot of this rivalry/hate whatever between clubs is just fan fiction stuff imo. Bayern bosses talk shit about Spanish debt clubs for as long is i can remember, but they also always say they have a good relationship and did plenty of deals in the past without much trouble.
IMO this is more about the player, like when Real wanted to snatch Ribery. Lewandowski isn't just very important for the team, it would also be a bad look to lose Lewandowski easily. New boss in Kahn, Salihamidzic always vulnerable to criticism, they had to let Alaba go and sell Thiago, now Sule as well, last season wasn't all that great especially towards to the end.
Many reasons there to play hardball, doesn't need any hate or agenda against Barca.