If it helps... no one is immune to a visit from Twatman..
I once had a Twatman appear as I was working with a client, I was wearing all my fanciest branded 'IM A QUALIFIED DOG TRAINER' gear (ok, hoodie with IMDT branding, polo with my company name etc)...
He crossed two fields to get to us in a private (but sadly easily accessible) field I had permission to use, and did so with the sole intent of telling me I was doing it all wrong and that he knew so much better.
My client had a dog that was super reactive and unhappy about men, hence the carefully chosen location, and I ended up having to call the police (at clients request) as he was in serious danger of getting bitten, and he still would not fuck off even when they showed up, but we managed to make our escape whilst he was arguing the toss with them.
We hid in my van until they'd escorted him away. Apparently he'd grown up with GSD (ie, his dad had one a billion years ago, never found out if he'd ever actually owned or trained a dog) and 'dogs always love me' and he thought we were at risk so he was helping.
Every female trainer I know has at one point or another had a visitation from Twatman. They're drawn like flies to shit when they see a woman with a dog I think.