That's because he's the Los Angeles Lakers head coach rather than the Cleveland Cavaliers coach.
That's why.
It's like a Forbes 100 company (Lakers) vs your local mom-pop store (Cavs)
There's more pressure that comes with being the coach of the Lakers...a successful franchise than it does when being the coach of the Cavs....a subpar franchise.
Remember how Tubby Smith got ran out of Kentucky, even though he won a national championship, went to 2 NCAA Finals, and had one of the top 3 best win pct in UK history, but yet he was STILL fired. Guess what...he left UK, went to Minnesota and he's STILL coaching the Minnesota Gophers without ever making the NCAA tournament in the 5-6 years his been there. Why? Because different standards of success are expected.
You cant realistically expect the Lakers fanbase to have the same idea of a successful season as a Cavs fan