Cllr Chris Pain, leader of the UKIP group, says it's because the pledge is all about promoting multiculturalism, "one of the fundamental things that’s wrong with our society". Multiculturalism is divisive and damaging to society because it emphasises our differences and encourages people to isolate themselves from the mainstream.
If the pledge - which doesn't appear to have been made public thus far - was about promoting multiculturalism and not combating racism then Cllr Pain and his colleagues were perfectly justified in refusing to sign it. And even if it was just about combating racism and not promoting a damaging agenda of multiculturalism and self-imposed racial segregation, UKIP councillors don't need to sign a piece of paper to remind them to treat everyone fairly and equally and it's a little concerning that the LibLabCon councillors in Lincolnshire don't seem to trust themselves or each other to do the same.