AND THE NYT explains it as if was the most normal thing:

The apartment checked off every box on the buyers’ wish list: airy, gracious, great views of the park. It was in a terrific building, one of the most prestigious on the Upper East Side. The couple moved in, unpacked and tried without success over the next few months to get settled.

In the end, they packed up and moved out, said their broker, Barbara Fox, the founder of the Fox Residential Group, because of a pervasive sense that they didn’t belong. It wasn’t that their neighbors were standoffish, ignored them in the elevator or didn’t invite them to their parties — though in fact the whole thing did come down to parties.

“Frankly,” Ms. Fox said, “they just felt the building had too many Republicans.”

To me it looks pretty intolerant and close-minded.