Hmm, I guess I'm in the distinct minority here. I don't know how it is in the states, but up here in Canada it's very common for rental properties (and strata condos too!) to have covenants about street side uniformity. For example, the street facing side of our blinds or curtains must be white or cream. No large structures are permitted on the balconies. No clothing can be draped over railings or dried on the balcony, etc. You will see flags pop out for Canada Day or during the recent Olympics, but generally hanging a flag in your window in place of, or in front of your drapes would be major no-no since it disrupts the uniformity of the building.
It's not a PC thing here, it just the aesthetics of rental living. I.e. bland and uniform.
Of course, I have a friend who lives in Duluth outside of Atlanta in a community of strata houses. Being a lover of Canada as well as his native USA, he put a Canadian flag on his flagpole for Canada Day. Several irate neighbors complained to the community association, saying it was disrespectful to fly anything other than a US flag.
