Note: I am not suggesting that the OP is guilty of this or was in any way being a jerk to the manager - I am just relating an anecdote that may have some relevance to the situation.
A decade or so ago, I worked for a small company that would go to a big convention on an island in Florida at the same time every year. One year we were booked into a great small hotel that was more like a B&B than a hotel. Everyone (the four or five of us who attended every year) loved it. As soon as the dates were set for the convention, our marketing manager would book the same place right away. One year they said they could not accommodate us. Not that they were booked already, but they just wouldn’t take our reservation. After a lot of digging, the manager found out the reason why.
It turns out that one of our party, after having no complaints whatsoever during the four days we were there, would call the hotel when we got back with a laundry list of complaints - dirty room, no hot water, got sick from the breakfast, etc. He did this several years in a row, never asking for a refund, but for vouchers in his name for future stays in this and sister properties. All unbeknownst to us.
They flagged us as a trouble party, and when the complaints came in again for the third year in a row, they just blackballed us from the property. The convention brought in thousands of visitors, so our four rooms were not going to go unfilled. I wouldn’t be surprised if the manager told off our guy, he certainly deserved it.
How does this relate to the OP? It’s possible that the manager who took the OP’s call had no knowledge of the situation, saw no notes on the reservation indicating any issues, and just thought he was dealing with a freeloader like our James. If the OP was not a frequent guest, maybe the manager decided that he’d get rid of the customer and tell him off to ensure that he doesn’t return. It’s a reasonable possibility.
P.S. My colleague was one of those people who somehow became convinced that getting free stuff was a virtue, no matter how much of an ass he was to get it. I’ve only encountered a few people like this in my life, and they are universally supreme assholes. It was so bad that every traveler in that little company refused to travel with James, flat out refused. The marketing manager agreed with us and only sent him on solo trips in the future.