How come you can't criticize anything nowadays, without being called a racist?

People are mad at the upcoming "The Little Mermaid" because it's a live-action remake. We want new ideas from Disney, not remakes of classics. However, say anything bad about it online, and people will call you a racist because the new Ariel is black. Therefore, you must be racist for not wanting to see this movie.

J. R. R Tolkien's Lord of the Rings did not have black characters. The new Amazon series does. Say anything bad about the series and people will call you racist because they assume you don't like the black characters.

How come you can't criticize anything nowadays, without being called a racist?
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