[weavie]

If you have to tell your manager this, they are not going to be the sort of manager who will listen.

[lambdasquirrel]

Not only that but chances are that they will become resentful and retaliate, perhaps unconsciously, perhaps not.

If you have a manager who needs to hear these sort of things they usually need to hear it in a very indirect way, such that they won’t lay the blame on you for being the messenger.