I'm a mavs fan why do so many people hate lebron?

Ok I've been a mavs fan every since Jason Kidd was there.(I'm a Kidd fan I think he's the greatest PG of all time) I wonder if people actually yze the game. If you watch the way the Mavs play D on him they double team him on the screen and roll. People make a big issue over the fact that he isn't putting up 30. He's making the correct play when you double someone all the time you expect them to get 30? No one said anything when the Celtics had wade on smash. When Lebron did what he did IN THE CLUTCH against BOS and CHI no one gives him his respect. But people be right there for his downfall. I will admit Lebron messed up last night because he missed alot of open shots. Why do so many people not like him like he's a grown man and he made a decision to leave Cleveland, people really got the magnifying gl on every little thing he does like he's human. I think lebrons dribbling moves have slacked off since his time in Cleveland and that among a few minor details is his problem, but to not respect that he's the best player in the NBA and is the second easiest scorer behind dirk is just HATING!