They do. Umps are judged on their performance. Most of them do a pretty good job, but I've sen a few who have off nights, whose strike zones change during the game, who are real pricks when challenged and give anybody a thumb who protests.
Hotheaded umps should be driven out of baseball. No place for them.
I was holding my breath in last night's NATS win over the BRAVES.
The count was 3-0 on Harper and on each of the strike calls making the count 'full', Harper didn't wait for the ump's call, but immediately dropped the bat and bent over in the box and unhooked his shin protector.
On the strike two call, he exchanged words with the umpire that lasted much too long to suit me. He could have been tossed.
On the 3-2 pitch he hit a double into the right field corner and then glared at home plate.
....today, Jayson Werth hit a HR with 2 runners on base, to left with two on making it 5-0 in the 2nd inning. When he crossed home plate, he exchanged high fives with everybody including Rendon who as next up, but completely ignored Harper who was on deck after Rendon. Never even made eye contact with him.
....then when Harper hit his 34th HR the next inning, Jayson Werth was the ONLY player not in the dugout when Harper returned.
Makes me think Werth gave Harper a talking to and Harper didn't like it over the thing with the home plate ump the previous nite.