That 30 year old will either become a Brightonian or he/she won't. Some move back to Surrey.
But people who move here because they like the 'mindset' and 'spirit', and stay, assimilating and contributing - Brightonians.
I think what HT is saying (correctly, in my view) is that when you have lived in a place long enough that most of your friends live there, you are a member of the community who probably works there, you feel that you belong there, then that is where you are from. You can 'become' a Brightonian...
Telling Timmy to sod off was ever so slightly tongue in cheek. He has always banged on about his uber-Brightonian credentials, and used people's location from their profiles to slag them off as if they were somehow inferior to him. I find him mildly irritating.
Personally, I love Brighton. It's...