"Twee?"
If we (Americans) are going to start using this word, let's apply it correctly. "Twee" is baby talk for "sweet" and means, according to Wiktionary, "Overly quaint, dainty, cute or nice." Something we call twee is generally exactly as its creator intended; we're just commenting on their lack of taste. It just doesn't apply to the use of of an inadequate term like "conceptual artist" to a badass like Ai Weiwei.