In no way does being proud of something mean one has to, defect, be proud of every aspect of it.
I'm proud of the principles upon which the republic of the US was established. Since then, we have often failed to live up to those ideals. There is now so much corruption, I've taken to actively correct the errors of my public servants, including the entrenched Deep State.
You should really consider reading the book. While it is one of the biggest books I ever read, it was very easy reading. It made me proud to know that America came from the British Empire and better understand our jurisprudence.