Twitter's new owner, Elon Musk, is mocking the platform's alternative Mastodon, but some may say he's gone far this time. In a tweet, which now appears to be deleted, he lashed at users complaining about Twitter's new updates and asked them to join "masterbatedone" if they have a problem. Musk's sarcastic tweet on Mastodon came at a time when the former's servers were down for hours for many users. Since Twitter's ownership changed last week, some users are leaving the platform to join rivals like Koo and Mastodon.