regardless of how ridiculous this guys comment is, an offensive twitter comment is no reason to arrest a person. public ridicule, sure. government involvement, absolutely not.
Yeah, well, that's why the US included freedom of speech and of the press in our written down Constitution. No right to arrest for "suspicion of making a malicious communication", the malice has to go beyond what appears to be the case here, e.g. imminent threat, or harassment.