I've had the unpleasant experience of being seriously discriminated against twice - firstly when I went to a college interview and was told by the interviewer that the college had had "my sort" there before and because they had caused problems the college would have to think very carefully about accepting me (they did in the end and I turned them down hah) and the other occasion was losing a job I had held for 7 years due to a change of management and a new Head of Dept who decided I suddenly didn't fit in despite there being no problems with my work/any complaints against me (this resulted in an out of court settlement that helped pay for a house I couldn't have otherwise afforded).
Reading about what Julia said, I honestly don't consider her remarks to be racist and no worse than making blonde jokes, mother-in-law jokes, Essex girl jokes etc. Where I work, colleagues banter with each other all time over all sorts of things and I would hate to be part of a culture that was too afraid to have a joke in case it might offend. From my experience, when people want to discriminate, there isn't even a pretence at humour.