Boots are a privately owned company and so long as it is within the law they can do as they please.
If you don't like what they have done, take your custom elsewhere. It really is that simple.
It's also called voting with your feet or capitalism. I don't think Jim Davidson or Roy Chubby Brown should be banned but I wouldn't pay to watch them in a million years and wouldn't expect a venue to be forced to host them.
Always be wary of people who suggest the world would be better if we...