Purple Yoshi said:I don't fully understand it, but he has the right to say it without people telling him it's wrong.
That is a huge and, unfotunately, very common misconception. The right of free speech may give him the right to say it, but that's all it does. The right of free speech does not and should not protect people from criticism. It only protects them from legal consequences.
If a stated opinion happens to be vile and seeks to defame, belittle, or otherwise negatively affect a group of people without any active contribution on their part, people are absolutely justified in calling that opinion into question. Trying to forbid such criticism is, ironically, an infringement on the right of free speech on itself.
Please do not spread this misinformation around any further.