Relative to what? If you put it into perspective, it's not such a big deal. I bet you could find more slanderous things about most families and most locker rooms, if you really dig. The only stuff that I find relative is whether it affects the team winning or losing.
Like McCarthy supposedly got some massages, and let someone else lead a meeting. Who cares, really? The meeting got held and the players got the info. Maybe Rodgers got frustrated with McCarthy's playcalling, but come on. Posters have been complaining about McCarthy's plays and playcalling for years, it's nothing new. It's nothing we didn't know.
I don't think Rodgers is ever going to be a big people person, but that's okay, not everybody has to be. I don't think he's going to intentionally undermine the new coach though, unless the guy is an idiot (which I don't believe he is).