You're certainly not crazy!
By the way, did Fru ever respond? Being somewhat familiar with his P&R presence, it seems uncharacteristic of him. I'll offer my own take on the story below.
I had in fact the same question -- not to you, BRI; your reversal on our Commander-in-Chief is well-documented. But Trump did win over large numbers of police with 'I support you' bombast, and I wondered how those policemen felt about this. Seeing the Gainesville PD and several others respond the way they did was incredibly affirming -- as much so as it was troubling to see the police in this crowd laugh and cheer. In similar vein, the Boy Scouts episode had people asking (here and IRL), "Eagle Scouts, Boy Scouts...how do you feel about this?" It's not clear what the (global) answer to this is -- one of the possibilities is very frightening for me to contemplate.
I think authority positions can lend itself to joking of this nature, so this isn't an out-and-out condemnation of Trump. He's not being inventively wicked so much as falling into a lazy pattern. We can do it from time to time here, too, as Mods policing the boards and encountering all manner of riffraff, so it's quite easy to recognize the sentiments expressed. Obviously our role is not comparable to both the dangers and the civic responsibilities encountered and shouldered by actual LEOs. But, it can be easy to adopt a suspicious or punitive stance. It's to everyone's great credit here that we do a better job of staying out of that fray than any board I've ever seen or been a part of.
Just musing and rambling here; please excuse that. Mostly I want to offer why I found that police rally story so disturbing. There's this fear and suspicion it can engender when you don't know whether that's something the people around you are also shocked by, or are pumping their fists for. These are some pretty suspicious times all around to be navigating in this country. But hopefully we can get through it without putting up walls between ourselves or assuming the worst in each other. To quote GWB