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We're guessing Mr. Met isn't smiling at what other MLB mascots are writing about him after he joined Twitter.

(David Richard/USA Today)

One rule about Mr. Met: He's always smiling, no matter what the Amazins are doing on the field.

But we imagine if he could change his expression to express fury, he'd do it after seeing what other mascots around baseball are tweeting about.

After the Mets' mascot joined Twitter on Monday, the Royals' Sluggerrr sent out a tweet about Mrs. Met:

Mr. Met responded:

Well played, Mr. Met. But other mascots -- Southpaw from the White Sox and the Indians' Slider -- soon started piling on with Mrs. Met jokes:

This proves once again that social media is the worst. You can't even be a friendly mascot without things getting dark quickly.