What ideas do you think are being suppressed here? The idea that this isn't a problem? The idea that we shouldn't do anything about it, because idiots will be idiots or jerks will be jerks?
The fact is that accusing the whistleblower of being impolite is just another barrier thrown up by thin-skinned people who cannot admit they've been wrong. The objective of calling it "bad style" or a "label used to suppress ideas" is itself to suppress the idea that something wrong has happened and must be addressed.