I totally understand why people want to go abroad. If you to swim in a blue sea on a hot day, Blackpool and Scarborough aren't the places to be. We're incredibly lucky to have continental Europe on our doorstep.
However, I do think we put the UK down too much. For example, last week, I went to Cambridge. It was a bright, sunny morning, and I remember thinking that there was nowhere in the world I'd rather be. I had a coffee, wandered around the bookshops, looked at the gorgeous old buildings - lovely. I'd sure as hell rather go to Cambridge, Oxford, York, Edinburgh or Bath than Las Vegas or Florida.
Weirdly, I've never appreciated the UK more than when I've spent time with people who moved here. I knew an anglophile American academic, for example, who taught me to see Britain with different eyes. We'd go to Cambridge and she'd say "wow, just think...this is the place DNA was discovered. Newton studied here. And then, 200 years later, Darwin was here, and then 100 years after him Wittgenstein and Nabokov. Isn't it amazing?" It was the same when we went to London. To me, London is a noisy, stressful, dirty place. But to her it was magical.
I'm no fan of nationalism, but we definitely go too far in the other direction. There are too many sneering liberals with too much influence. They pretty much dominate the media and the arts, and we then absorb their self-loathing. I'm often weirdly uncomfrotable when foreigners like Britain. I sort of expect them to hate the place.