Yes, the use of local norms is politically correct, because it is people doing what they want to do locally, rather than what is fair, or what the correct rule is on a state or national level. Local norms is politics at its finest, because lazy politicians are able to get away with doing what they want.
Local norms are politically correct in that city ordinances have laws that uphold local community standards. Each city is different and therefore has different laws. One locale may have different standards than others, and there is nothing wrong with that. As long as the laws are just, local norms are politically correct in every way.
The use of local norms that we see in communities all across the United States of America along with the rest of the world can be politically correct when it comes to things. However, it depends on the actual local norms that we are talking about. Some things may be bad where others are not.
I do not believe the use of local norms is politically correct. People in this country move from location to location, each area is not homogeneous. I believe the acceptance and use of local norms is an indication of racism. Yes, different areas may be known for certain things, but that is not representative of the entire population.