I will likely be leaving RedBubble due to their lack of understanding of copyright law when it comes to fair use the parody genre.
“A parody, also called spoof, send-up or lampoon), in use, is an imitative work created to imitate, or comment on and trivialize an original work, its subject, author, style, or some other target, by means of satiric or ironic imitation.”
“Although a parody can be considered a derivative work under United States Copyright Law, it can be protected from claims by the copyright owner of the original work under the fair use doctrine, which is codified in 17 U.S.C. § 107. The Supreme Court of the United States stated that parody “is the use of some elements of a prior author’s composition to create a new one that, at least in part, comments on that author’s works”. That commentary function provides some justification for use of the older work. See Campbell v. Acuff-Rose Music, Inc."