You’re nothing compared to these guys. I’m shocked that YWN allows such comments on their site.
That being said, the question is not how you treat those in your office who you know, but how you treat a general person with similar aspects. If you are neutral until proven otherwise, than you are not a racist (IMHO).
Also there is a cultural divide between groups (as there should be between us and non-jews, for example). That may have something to do with it as well.