According to Michael Wolff, one of the reasons Schlump hates Comey so much is because he's too tall! I kid you not, on the Daily Beast's Inside Trump's Head podcaet, Wolff said that Trump is very uncomfortable any time he's not the tallest person in the room. James Comey is 6'8," which he means he TOWERS over Trump:
Wolff claimed on the Inside Trumps Head podcast on Tuesday that Trumps height insecurities date back to his first term, when there were enormous problems that the 6-foot-8 Comey, a political foe who probed his ties to Russia, was so much taller.
Trump, who has almost a need, a motivating need to be the tallest guy in the room, had enormous problems dealing with being so much shorter than an adversary, Wolff said.
He went on to claim that Trumps team would coordinate to ensure that, on the occasions he had to share a room with Comey, that the one-time FBI director would already be seated by the time the president made his entrance.
There was always an effort to choreograph this, of having Comey seated

before Trump came into the room, of any other way to create a situation so that Trump would not be conscious in that immediate moment of Comeys really impressive height, Wolff said.
Source:
https://www.thedailybeast.com/unusual-reason-donald-trumps-james-comey-grudge-goes-so-deep-author-michael-wolff/
Is that hilarious or what?
Of course, that's far from the only reason for Trump's resentment of Comey, but I just love the idea that Comey being so tall was evidently a major burr under Trump's saddle during that first term ! rofl: