Great post. I agree with Messofanego that your use of The Dark Knight quote is very apt. Anecdotally, when my cousin told me that he voted for trump he literally couched it as being frustrated by both sides and wanting to elect the most unqualified person possible because he wanted to see the world burn.
The post is soapbox, rhetorical nonsense with no basis in what is actually happening on the show. This one throwaway line cherry-picked from one episode that was intended to show that families no matter what race or creed can go through some difficulties in life is somehow going to normalize racism and homophobia. Where are the quotes of how Roseanne loves Gina (DJ's African American wife) or Mary (their mixed race daughter)? Or the mentions of how in the initial run, one of her best friends was gay and she even planned a gay wedding?