No Muslim has the right to say wrong about Sunnis or about Shiites. All Sunnis and Shiites are Muslims. The non Muslims are only those who denies that no God except one and only one God and also denies that Muhammad (PBUH) is God's prophet.
It is not of interest of any Muslim to know why someone whoever doesn't like Shiites or doesn't like Sunnis. No Muslim, whoever, has the right to expel another Muslim from Islam because he some views different from his/her. Any Muslim believing that No God except one and only one and that Muhammad (PBUH) is His prophet and messenger, then he/she is Muslim and only Allah (or God in English) would judge him on the Day of Judgment. Both Shiites and Sunnis are Muslims.
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