My anecdotal evidence comes from the experience of the real world while your ideas come from pre-judices and fiction.You're using anecdotal evidence to explain a much wider issue.
I could give you an example, a Turk could visit Greece and have a great time and people will tell him that Turks and Greeks don't have a reason to fight and they'll share some Ouzo. That doesn't change the fact that Greek society as a whole doesn't like Turks.
The fact is that non-Arab Muslims are Mawali. A lot of Jews in the US hate non-Jews, but are they going to be outwardly rude to them at all times? No. They treat the goys well.
Prophet Mohamed, as an Arab himself, banned racism and declared that Arabs don't have superiority over non-Arabs. A Muslim, be it Saudi or not, can NOT see anyone less just because of his ethnicity. That's literally haram.
The ones they do are a small minority of low-IQ secular/nationalists&racists. Just like everywhere.