Point out where he is wrong. If you bothered to read his post then you would realize that he is criticizing the "Sunni party" too. In reality this is a conflict about regional hegemony and power and religion (sect because both Sunni and Shia are sects of the same religion) is used as fuel as it's the most effective ideology together with racial ideologies.
Where is the hatred for "Shia's" and who called a "Shia" advocate here? I know around 50 Shias in person from all corners of the world and none of them want to have anything to do with the Iranian Mullah's just like I know twice as many Sunnis who want nothing to do with the KSA leadership.
What has Bangladeshis in KSA to do with anything? Yes, there is a minority of racists in KSA like anywhere else and yes there have been a few unfortunate episodes. Just like there have been millions more of such episodes towards women, minorities, ethnic groups in South Asia.
There have also been episodes such as Bangladeshis on the death row in KSA being freed (blood money paid by local organizations), prisoners freed and a few days ago this news emerged.
Four million Burmese entitled to get long-term residence in Saudi Arabia
Most people in KSA do not give a crap about race. KSA is one of the most diverse countries on the planet due to being located between 3 continents (remaining Asia, Europe and Africa) and due to hajj and umrah that has taken place for the last 1500 years. Due to that every single race lives in KSA today. You have Blacks, Whites, Middle Easterners, South Asians, South East Asians, Central Asians, Horn of Africans etc.