As someone who still pitches - I know I can shake the catcher off (although all catchers hate this), but to be honest, I rarely do. Personally, I want to "think" less when I pitch.
What I find happens a lot is I think Pitch A -"slider low and away" and the catcher calls Pitch B - "inside fastball". Is an inside fastball a terrible call? Probably not (if I execute)....is the slider away a "better" pitch for this situation? Maybe - but by how much? I mean f***'d if I have time to analyse this while standing on the mound....so I don't shake the catcher off unless:
a. I truly don't feel comfortable throwing that pitch in that location (maybe don't have a good feel for the changeup that day, or I'm tiring and leaving the slider up too much to throw it in this situation); or
b. I think Pitch A is tangibly better to throw in this situation than Pitch B - and that has to come almost instantly to me, without any thought at all.
Point being - even though the pitcher has the ability and "right" to shake a catcher.....The catcher should take a lot of the blame when the wrong pitch is throw (if executed properly). Pat's just trying not to throw Martin under the bus b/c of the PC police and MLB Bruh buttlove.