While I agree in principle it’s still delicious irony that Comey was hip-deep in meaningless ‘diversity’ treacle when the news hit him. Perhaps it’s a measure of his arrogance and sense of job security that he regarded it as a prank.
Oh, I can share the schadenfreude that Comey very well may have deserved how it played out. We don’t know what all happened between the two, but if Comey was enough of a twit then maybe Trump indeed felt like dissing him by publicizing the firing before the letter was received.
Professionally, however, it should be done in person. Even if he “deserved it”.