Yes, bigots are bad. And if you see a bigot on the internet, you don't have to click on their profile or view anything they put out into the void...And it is a void by the way, the amount of people that their content appeals to is a very small number of people.
So what's the harm in them having a platform if hardly anyone will even pay attention to them?
dealing with someone who physically shows up to your place unwanted and uninvited isn't the same thing as allowing them to tweet mean things.