No, you're right, there really isn't anything "wrong" with loving your country. There isn't anything "wrong" with believing in Jesus or Fairies or Allah or Unicorns either, but that doesn't mean you should be allowed to disrespect other people.
The way the OP expressed his view, it feels no different from racism, putting oneself above others, for something which cannot be chosen. If you are going to post about loving your own country, post about how much you love everyone else's countries first.