No actually, he's right. Many knife laws were created specifically to target minorities.
For instance, the gravity knife ban that's in place in many states exists because the state of New York realized that poor people who wanted to carry a safe, concealed knife on them were using gravity knives due to their low price making them more accessible than other folding and automatic knives at the time. New York saw a bunch of minorities carrying gravity knives, figured that they must be a "gang weapon" and banned them, and about half the other states followed suit immediately after. Some states have since reversed course on this obviously racist law, but many are still holding out. The ban has nothing to do with the safety of the knife, it's only because lawmakers were afraid of armed minorities.