Today in Organizational Behaviour we learnt about
Discrimination & Exclusion
The difference: Discrimination is more obvious and overt, where you target a group because they are different from you.
e.g: "I am firing you because you are dyslexic."
However, racism/other -isms are now socially unacceptable (at least in the UK). So people resort to Exclusion, which is more subtle and hidden, but nevertheless shows that you dislike a certain group.
e.g: being unfriendly to another race, trying to get as far away as possible from 'that brown dude', etc.
So pull that cotton wool out of your ear and go find some good ol' soul-nourishing and some good company.