They are without a doubt bullying, I don't think anyone can argue that fact.
However I am unsure as to whether it can be classed as racist or not.
Shilpa was wrong with the way she reacted to Jades whale pronunciation and to back that point up Jermain actually pulled her aside later in the programme and told her she had been over the top.
As for the way she went on about Dirks name, I saw that as more of a piss take out of herself than anything else, she was saying it and laughing because when she pronounced it (with her Indian accent) it sounded like duck. Nothing wrong with that.
I think that the 3 girls together are behaving like stupid bullying girls, they will look back on their behaviour and be ashamed. Danielle is making the biggest fool out of herself as she is being the most spiteful.
They were however right about the chicken cooking thing Shilpa chose to ignore them totally when they told her how long it needed, she did then apologise when she served the chicken.
I still don't like Shilpa (shes not my cup of tea too Divaish for me) but no matter how much I don't like her I still find the bullying disgusting.