I was born and raised in Blackpool, and it is a dump - spoilt by stag and hen parties fighting and vomiting their way through the weekend in the season. And then a ghost town in the winter. There are many, many pretty areas to Blackpool that the average visitor probably wouldn't know about but I agree - it is now a dump.
I lived in Brighton for a year and could not wait to leave. I hated the place, almost on an inexplicable level. I honestly felt nothing but relief the day I moved back to London. I should have liked it. On the surface - the tolerance to alternative types, the North Lanes shopping, the beach, the lovely quirkiness of the painted houses etc, etc. Having lived in Hackney previously and grimaced my way through the pretentiousness that is Hoxton, Dalston and Shoreditch...the wanky pretentious side of Brighton didn't bother me at all.
It was just the whole place. I didn't feel right there. I'll never be able to explain it - I should have loved it. I can say Blackpool is a dump and mean it, and not feel defensive just because I grew up there...it is a dump! But I have never, ever felt anywhere like what I felt living in Brighton. I think it kind of bothers me that ten years later, I still can't figure out what it was about the place. I keep thinking - I should have loved it, but I didn't. I hated it. I hated every second being there, and couldn't wait to leave. Weird :)