Presumably the key point is not that it was on Twitter, but rather it was said in public. The medium is unimportant: its the same as if someone posted such thin

Presumably the key point is not that it was on Twitter, but rather it was said in public. The medium is unimportant: its the same as if someone posted such things as a blog post, or said it on TV or whatever. You might like to treat Twitter like a private conversation, but when the posts are completely publicly accessible (and when the person has 1000s of followers) it is certainly not private.