It's basically a straw man argument.
A straw man is a common form of argument and is an informal fallacy based on giving the impression of refuting an opponent's argument, while actually refuting an argument that was not presented by that opponent. One who engages in this fallacy is said to be "attacking a straw man."
Detesting something that does not exist apparently wins a lot of points with liberals.
As for the title of the song, it's a play on words and an allusion to two other songs, one of which was an allusion to a previous song. The Who published a song called "The Kids Are Alright" in 1965 and The Offspring published a song called "The Kids Aren't Alright" in 1998.
Allusion is a figure of speech, in which one refers covertly or indirectly to an object or circumstance from an external context. It is left to the audience to make the connection; where the connection is directly and explicitly stated (as opposed to indirectly implied) by the author, it is instead usually termed a reference. In the arts, a literary allusion puts the alluded text in a new context under which it assumes new meanings and denotations. It is not possible to predetermine the nature of all the new meanings and inter-textual patterns that an allusion will generate. Literary allusion is closely related to parody and pastiche, which are also "text-linking" literary devices.