That's because every single person who slights him even the tiniest bit was obviously always his enemy, and he obviously always knew this. Probably a RINO, a secret Democrat, a stealthy undercover deep state fake Republican. Very bad person, could not be trusted, in fact Trump barely knew them, they begged him for the job, but they simply weren't up to it.
Even if he praised that same person to high heaven just the day before.
Evidence: the 263 people he hired and fired in the last administration (with the firing usually done via Twitter, when they were far away from wherever he was tweeting from).
Also Kevin McCarthy. And Chris Christie. And Rex Tillerson. And Omarosa. And Steve Bannon. And Scramucci. And Reince Priebus. And Mike Pence. And Michael Flynn. And John Kelly. And Sebastian Gorka. And John Bolton.
There are literally hundreds of people who swore allegiance to Trump, only to be thrown under the bus.