I think for some it’s a mix of patriotism and having poor taste in decor. I know people who also have American flag swim shorts, sunglasses, etc. Also, it’s not exclusive to America. My British side of the family (especially the ones who’ve met the former Queen) have a weird amount of UK flag decor too, ranging from clock faces, throw pillows, and even an armchair covered in a giant union jack.
I have nothing to say other than Elon is a dipshit. Pass it on.