The UK Attempting to Ban Trump

Recently, the UK brought up the idea to ban Donald Trump from coming to the UK.  Their arguments were all against Trump, claiming that he should not be allowed in the UK because of his racism and political views.  But why the UK, of all countries, would try and do this?  Why wouldn't Mexico try and ban Trump, who has made comments about Mexican immigrants that have offended the whole nation of Mexico.  The point I'm getting to is that if Trump is considered so evil in the UK that he may possibly be banned from being there, why don't more Americans see him this way.  I know that the UK and Republicans in America have different views, but I find it even more sad that so many Republicans support him.  Maybe my views are biased because I was raised learning the more democratic and liberal views in our nation.  I believe that Trump's racism is blasted all over the place to make him look more racist than he actually is, but I am not saying he's not racist.  I believe Trump is racist, but I wouldn't compare him to Adolf Hitler.  Time will tell, maybe this could all be an act, but why have most Republicans been supporting Trump and not the other candidates.  One of my ideas is that Trump is the little voice in most Republicans' heads, saying what they all have been wanting to say for years, and Trump is the guy.  Trump is the guts of the Republican party but he has gone over the line with some ideas.