If Donald Trump is barred from entering the UK because of what he has said, then equally, the UK should also deport those Muslim preachers of hate (you know the one's we continually hear about in the media) . You know they won't deport anyone, citing "freedom of speech" (the very thing DT is practicing)
Actually hate speech is a criminal offence, which is why many clerics are banned from entering the UK and many are deported, although the ECHR has made it difficult to deport them. There are scum such as Choudery who know what they can get away with, but they will get him eventually.