I almost edited my comment to revise my position, and I was waiting for someone to call me out. I'm glad you did. Immigrants built the US (Canada too), and fully earnestly I believe it's what makes America great. I would be angry if someone questioned, say, Ilhan Omar's citizenship and patriotism because she was born elsewhere. I can't not hold that opinion simply because Musk is a piece of shit.

So without snark, I don't question his citizenship. I don't believe he holds the values I think make an "American" (or, uncomfortably, maybe he does…), but for better or for worse, a citizen he is.