Heavyweights don't go to heavyweight because "they are big enough to make heavyweight".
They go to HW because they are too big to make LHW, whether genetically or due to lack of discipline. Of course this isn't absolute, but guys generally go to the smallest weight class they can reasonably cut to.
This "weight bully" crap is an intellectually lazy way of discrediting fighters you don't like. Like 95% of fighters will fight at the lowest weight class they can if it doesn't kill their performance or they don't repeatedly miss weight. Even one or two bad weigh ins don't typically change that.
You don't have to like it. I don't like it, but facts are facts.
Your boy Conor wasn't some victim of the bigger man. He was skeletor fighting at 145. I didn't complain about the fact that he was clearly much bigger than his opponents, so why are you crying "weight bully" when he lost to guys his own size?