I can read, but just because he is Mexican, doesn't mean he can relate to the material. I can relate to his schtick because I had a similar upbringing. Ergo, race/nationality has nothing to do with whether someone can relate to the material it's more about a persons background and environment that thye grew up in.
If you think he is not funny, that is your opinion. In fact, I don't care for his current show right now. I love his standup and his old show, but not the current one. It is just not necessary to label someone as racist when there really is nothing to back that claim up/