It’s not a challenge for the ball (obviously) so careless, reckless etc doesn’t come into it for me. Therefore you’re left to decide whether or not it’s violent conduct. VC does mention excessive force or brutality, but this doesn’t come anywhere near that in my opinion. Caution for lack of respect for the game is adequate for me.
My point about comparing it to pushing a player was that Law 12 mentions VC being against “an opponent, team-mate, team official, match official, spectator or any other person”. It doesn’t say you can push a player sometimes but can’t ever push a match official. If you deem this to be VC then in my mind you’ve also got to send him off if he did that to a player.
I’d be in favour of changing the law so that any deliberate contact with a match official is deemed VC but that’s not how it’s worded just now.
Slight tangent but if you take something like the disallowed Liverpool goal at the Etihad a few months ago there were plenty of people who said it didn’t feel like an offside offence but because of how the law was worded it was probably the correct decision. Similarly here VC maybe feels like it should be the correct decision but by the LOTG I think a caution is correct. It’s a dangerous slope to go down if we start giving decisions based on what we “feel” the correct outcome should be instead of looking at the LOTG.