79% of their cases that SCOTUS decides to hear are overturned. That represents less than 1% of all of their cases.
To give you a scope of how cherry picked that metric is, the ninth circuit heard over 10,000 cases in 2015. Probably about 1,000 were presented to SCOTUS for review. The Supreme Court selected 11 as actually needing review (ie, were possibly wrong), and reversed 8 of those.
This is not getting 79% of your job wrong. This is getting 99.9% of your job correct, and then people reviewing your performance on the 0.1% that your boss wants you to explain and possibly redo.