Hader's Twitter account has since been locked and the offensive tweets have been deleted, the outlet reported.
The news of Hader's old, unearthed tweets bubbled out as the All-Star Game was going on, and reporters met Hader in the locker room right afterward for comment.
He said it happened when it he was 17 years old and he was "immature", but it's still "inexcusable".
'Being 17 years old, you make stupid decisions and mistakes, ' Hader said. "And like I said, it doesn't reflect any of my beliefs going on now". "It doesn't reflect any of my beliefs now". "I'm deeply sorry for what was said".
"When anybody does something like that, you're always surprised", said Cain, USA Today reported. "At the end of the day, you've got to give people a second chance, you understand you have to forgive people, move on from it". 'I really don't know exactly what's all out there'. That's gonna stick with him too, and may land him in trouble with Major League Baseball.
Under fire, Trump says he misspoke on Russian Federation election meddling
Trump chose before, ultimately putting the issue into the spotlight just 72 hours before the high-stakes meeting, the people said. If Putin was looking for a more pro-Moscow policies from the United States, his election interference backfired in a big way.
Hader blocked his account on being alerted to the scandal after the game at Nationals Park in Washington DC, and later apologized for the messages. Hader said he did not "vividly" remember the tweets. Hard to say, given that Hader wasn't even drafted yet when those tweets were made and given that MLB's social media policy was not even in place then. We're still learning who we are in high school, and you live and you learn.
Deputy Commissioner Dan Halem, speaking outside the NL clubhouse, said he had spoken to Hader.
Some of Hader's family removed his replica jersey while at the All-Star Game, according to Jeff Passan of Yahoo Sports. There's no excuses for what was said or what happened'.
Brewers outfielder Christian Yelich said: "I don't know what he did or what happened".
The night didn't go well for Hader on the mound either. The American League won 8-6 in 10 innings, in a game which saw a record 10 home runs.
Teammate Lorenzo Cain called Hader a "great guy", and acknowledged that everyone has "said some insane stuff when we're young".