It's rude. I'm sure not everybody who does it is a jerk, but it's a fine way to announce to the world "I'm really unpleasant!"
Besides, if people thought Ortiz was done then they should be annoyed with the on-field staff and front office. They're the one paying a cooked DH and writing his name in the lineup.
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"Walleye, a lot of things are going to go wrong in your life that technically aren't your fault. Always remember that this doesn't make you any less of an idiot"