It's weird, isn't it. I had a conversation with a relative recently that went along the lines of:
Her: Brexit will be great, we can get back to being British (she's an emigrant from Ireland by the way but that's another story)
Me: It's a bit of a pain that it'll be harder for us to visit/my kids to work in London etc
Her: Oh, it won't affect Irish people
Her: Brexit will be great, we'll be able to import/export to all sorts of countries and things will be much cheaper
Me: But at the moment Britain only has trade deals with a few countries, when are new ones going to be sorted out?
Her: It'll be fine, we can trade with the Commonwealth. And anyway Europe will have to give us a good deal on trade because they are much more dependent on us than we are on them
Me: 
Me: What about the Irish border?
Her: What about the Irish border? There doesn't have to be an Irish border, I don't know why the Irish government is being so ridiculous about it, we don't mind Irish people over here
Me: [baffled][furious]
Sadly she is an ancient relative and I'm not allowed to tell her to grow the fuck up.