The U.S. Supreme Court affirmed that even hateful or offensive speech is protected by the 1st Amendment to the United States Constitution.
Writing the opinion in Matal v. Tam, which will become known as the “Slants” case, Justice Samuel Alito wrote:
[The idea that the government may restrict] speech expressing ideas that offend … strikes at the heart of the First Amendment. Speech that demeans on the basis of race, ethnicity, gender, religion, age, disability, or any other similar ground is hateful; but the proudest boast of our free speech jurisprudence is that we protect the freedom to express “the thought that we hate.”
In his concurrence, Justice Anthony Kennedy agreed:
A law found to discriminate based on viewpoint is an “egregious form of content discrimination,” which is “presumptively unconstitutional.” … A law that can be directed against speech found offensive to some portion of the public can be turned against minority and dissenting views to the detriment of all. The First Amendment does not entrust that power to the government’s benevolence. Instead, our reliance must be on the substantial safeguards of free and open discussion in a democratic society.