Of course I'll sing the National Anthem, hand over heart, looking at the flag. I will fight to defend the constitutional rights of anyone. No question.
But patriotic fervor can be used to be divisive, instead of unifying, and can be used to virtue signal just how much more you love America than, say, the libs. It's a subjective standard, but you are correct in that we should definitely carry out the basics in the spirit of unity.