Of course they can. But if their daddies have been in Hollywood for decades and they were effectively raised in both places, then yes, they intuitively have roots in both places. How is this xenophobic? Allow me to clarify right here and now the following (though did you actually read through that comment fully? Or were you just triggered that I had insulted you after you insulted me?):
-Canada is its own country with its own culture and history and values, though due to many factors there is a lot of cultural overlap with the United States
-Hollywood is a dominant Western entity, for the worse, which means that due to globalization most of Western media gets imported from Hollywood. That is not right, and it does inform an American tendency to see ALL media as inherently American, which is it not.
-Canada is similar to the United States in no small part in light of its rich and violent history of racism, which is very much alive and well today. Would you like me to send some articles about Black Lives Matter in Canada? Or perhaps some Indigenous voices on the effects of Trudeau's beloved pipelines or generational trauma from being forced into Indian schools where they weren't allowed to speak their languages or practice their cultures or be with their families? I know you know about all of this so I'll keep it short and simple: America sets an extremely low bar but yes, in terms of basic human rights Canada is generally better than America, but it's still racist and it's still classist and it still has the same problems that Schitt's Creek has regardless of where it's set. I could remove the part about America and the issues would still stand.
-American and Canadian cultures and media are still closely linked. We come from the same British and French colonizers. Yes, hundreds of years of change defining distinct cultures between the two, but they're not so distinct that most viewers would be able to differentiate style/references/a lot of cultural pillars that would be patently and immediately obvious between two widely different cultures. That's not xenophobia, that's the reality of Western English-speaking cultures, which I'm not saying are "bad" (which would be xenophobic, please look up the term), I'm just saying are in many ways more similar than not.
Aside from living in Los Angeles, the Levy's also chose to make this a show with primary references to American cities. There are no points during which they discuss crossing the border into Canada or "back" into Canada from whence they came; YES, American media hegemony probably informed to a degree their decision to focus on America and American audiences by default (by the assumption that except for the Canadians catching their accents or the scenery in which it was filmed.. or who simply saw it proudly aired and produced by CBC before Netflix made it a global sensation), but it was still a decision that they comfortably made. And it shows up in the media. You can't accuse any American person who perceives Schitt's Creek as being American as a "xenophobe." Or, you can, but you'd be proving yourself as the pugnacious moron that I accused you of being before.