Talk to anyone who previously lived in a communist regime. It's overwhelmingly that they feel these were repressively tyrannical.
Link: https://www.google.com/search?q=hong+kong+protests+american+flag&rlz=1C1ZCEB_enUS791US791&source=lnms&tbm=isch&sa=X&ved=0ahUKEwifrtKPuY3kAhVLdt8KHVMNACMQ_AUIEigC&biw=1024&bih=627