Wild how much people seem to care about how a random guy probably thousands of miles away runs his business. Even if you lived in Manchester I don't see why this would be such a big deal. Annoying, sure. But is it really so bad to have to walk across the street to the next bar?
Your behavior feels wildly more intolerable than theirs. They want to provide a measure of safety to the place. You don’t have to go. There are plenty of places that will take a lonely person like you. But some people will prefer to frequent an establishment specifically for this, so going that they go out of business just because you don’t like it is an awful position to hold.