Why is there a double standard in sunni belief? - Part 2

Abu Zoo`ra ar Razee ® said:
"إذا رأيت الرجل ينتقص أحداً من أصحاب رسول الله -صلى الله عليه وسلم- فاعلم أنه زنديق، وذلك أن الرسول -صلى الله عليه وسلم-عندنا حق، والقرآن حق، وإنما أدى إلينا هذا القرآن والسنن أصحاب رسول الله -صلى الله عليه وسلم-....". "Tareeh al dimashk"

Al-razi says: beware, if you see a man criticize even 1 of the companions then he is a "zindeeq" infidel. That is because the prophet (pbuh) is true and the Quran is true, and it is the companions who brought to us the Quran and the sunnah of the messenger (pbuh).

Here al-razi is saying that if you criticize the integrity of the companions then you are criticizing the integrity of the Quran and nobody will do that except an infidel. In other words, shias are infidels for criticizing the companions.