Sure there are partisans for both. Then there are nonpartisan like me who don't have a set opinion. MJ was clearly GOAT to me, and still is, but LeBron keeps doing things to make my opinion change and I may someday put LeBron over him. Or maybe not. Others are set and can never change their opinion.
So then you agree that many Lebron partisans are just as stubborn as MJ partisans.