Just because a person belongs to a group (work colleagues, barangay, city, or country), should it necessarily mean  that one has to like everything about it. He probably likes most of the things that represents his identity/culture. But he cannot be forced to like everything. If he is to criticize, allow him specially if it is constructive. But don't be amazed because he dislikes something and speaks about it [in a very professional way (by the way)].