Jellico was also an ass in Chains of Command, not just to Riker but to Picard too. He was riding Riker since they first met. He wanted more of an assistant than a first officer.
This is non-sense. Jellico wasn't an ass until Riker didn't follow orders. If I was a new captain and the very first order I gave wasn't followed by my second-in-command, it would sour me on the person pretty damn quick.
Plus it likely didn't help that Riker told Jellico Delta-shift was a no go not too long before they were supposed to be on duty aka almost the last minute.