Sports people always seem to get special treatment. When I was in high school, the football team was always presented at the first school assembly and cheered as heroes. Yet, the kids who were attending some classes at UCLA, building computers long before they were a "thing" (late 1960s), and anyone else who was performing stellar non-sports activities were just considered weird (the term "nerd" had yet to be coined).
When people get together to talk, it usually seems to be sports. People pay high sums of money to go see a sports event and large expensive stadiums are built to hold these events. Watch the local news and most of it seems to be sports these days. When people from different parts of the country meet and discuss where they are from, you will often hear "go <name of favorite local team>!", which always sounds silly and pointless to me.
The general public has been going nuts over sports for years, so why are we surprised when these folks act the "prima donna"? Their adoring public created that situation and then gets bent out of shape when these sports figures claim what they think they are owed because they have been told so, for so long.
If people treated sports figures as no different from anybody else and paid them far less money and attention, we wouldn't have this problem
Tony