HR is as JohnHC said there to protect the Company, however this also includes protecting the employees environment.
They can't do things about issue's or preferences about how your manager communicates.
They are there to solve Problems between employees. If there is anything your Manager (in this case) isnt allowed to do according to law, internal rules or even social protocol they can and probably will act on that.
Also keep in mind that the size of your HR compared to your Company is probeplyprobably 1 to 10+ and they have quite alot to do.