Of course she was joking. If you actually followed her on twitter, you would be familiar with her humor and perhaps would have considered her response, "Selective outrage committee so worked up about a joke! How about some outrage 2 help solve Opioid Crisis, Mass Shootings, Puerto Rico?".
Honestly, consider switching from FoxNews to her twitter feed for better news analysis and some laughs. She's far more reliable.
Beyoncé is not an ally. Actions speak louder than words, Mrs. Carter. #Dubai #$$$