How would you define tone policing, and how is it distinct from any criticism of tone whatsoever?

Say your buddy wants to convince your org to do some mutual aid project. He's going to make some remarks at your meeting tonight and he gives you his notes to look over. You think he's got a good idea for the project, but he's planning on insulting everyone right out of the gate and being as abrasive as possible when he takes questions.

Are you tone policing him if you say that's a bad idea?