It was probably unintentional but does that mean he should have the right to do it? Yes, he should have the right. You don't have to agree with him. You have the right to be offended if you wish. But he has the same rights as you have: the right to hold a different opinion and express it.
From the final paragraph in the abovementioned Freedom of Speech article:
They need to learn that enforcing “respect” in discourse cannot be harmonized with Cambridge’s free speech policy, for if you give someone offense with your words, they can and will claim that you’re not respecting them.
But saying that “you don’t respect me” is no more of an argument than “I’m offended”, and doesn’t belong in any regulations about free speech.
My dad spent 40 years mastering his craft, and last week someone half his age told him how to eat.😠
What did you you think you would have by your current age that you don't?


and who gets to decide which are wrong VS? Who is clever enough moral enough to decide on what constitutes wrong opinions.