Just a casual observation: I've been working in Saudi for the last three years and can 100% assure you that racists and bigots are more common in Saudi compared to the UK. It could be the demographic I was working with, it could be that people that are attracted to my area of work happen to have a predisposition to bigotry due to their based on personality type... What ever the reason behind it is, it is notable.
That Erebor guy (wtf man btw...) is clearly an idiot. That being said, minority ethnicities in western countries typically have closer ties to institutionalised religion, the vast majority of these institutions have for a large portion of their history promoted homophobia and provided stepping stones to bigotry, including racism to some extent. So when people say that a specific ethnicity tends to be more racist than another, don't ignore demographics. Perhaps one ethnicity dominates a higher or lower socio-economic group, where they are under extreme financial pressure and as such are much more likely to lash out against those with money (typically the dominant ethnicity in that country). Shia muslims in Saudi (in bold because it's a regional demographic thing, not a religious or ethnic thing) are much more likely to rebel and lash out against Sunni muslims in Saudi just because they are so oppressed; it isn't their ethnicity or religion that drives any negative actions, but their social situation. Same concept can be applied to Ukrainians living in New Jersey, or black people in a super white neighbourhood - it's about demographics.