Cow-Towing?

• This Metallica backlash is Karma for their cow-towing.

kowtow |ˈkouˈtou|verb [ intrans. ] historical
kneel and touch the ground with the forehead in worship or submission as part of Chinese custom.
figurative act in an excessively subservient manner : she didn't have to kowtow to a boss.

noun historical
an act of kneeling and touching the ground with the forehead in such a way.