Not a big fan of patriotism, never understood why an accident of birth should elicit feelings of pride. Nation states seem unavoidable as a concept, and we should aim to participate in them seeking for the best for our country in the context of looking at mutual interests with other states.
While you might feel that there is an attempt to shut down discourse by using the appeal to patriotism, I would suggest much the same is done on this subject by people accusing others of being Little Englanders or racists. The idea that the 17 million who voted Brexit are all somehow worthy of those tags is ludicrous. Just as the idea that what they meant by that vote, and what vision they have of the future is the same is also ludicrous.