How can I file a complaint against the Assistant Sales Manager at my store without it coming back on my store?

Hey everyone, throwaway for obvious reasons.

Somewhat recently, we got a new ASM in our store, one that moved from out of state and went from a GM position to this position. The reason for this post, is that of the last few weeks, the ASM has been constantly on the radio for anyone that will listen to complain how it is "not fair" that they have to work every other Saturday night when the rest of us work it every week. Or how "its not my job to status the truck" or work freight when they are having a bad day.

There are other issues when they try to work in either Print and Marketing or Tech Sales. Such as orders getting messed up and the answer being "well no one can do their job" when confronted about it.

Aside from all this, I feel that a grey shirt shouldn't be bringing the attitude of "its not my job" or "its not fair" openly in front of anyone. I want to file a complaint about it, but don't want it to come back hard on anyone else in my store for voicing our thoughts.

Is there a proper way to do this?

Thanks in advance anyone