I'm not sure how much to believe people who are saying how wonderfully inclusive and friendly the people in the North are, when it's said in the same breath as being spectacularly nasty and unwelcoming. This thread got nasty very quickly. Just because OP has no experience of an area, and only had negative things told to her by the locals of that area to go on, doesn't mean she is snooty nor has her nose in the air. I'm not sure her lack of knowledge or familiarity called for the unpleasantly tinged shit about whippets and cloth caps. She did none of that stereotyping but got accused of it anyway.
All I can say is, thankfully, there were a lot of truly friendly posters to provide balance.
I am from a culturally diverse former industrial area and not southern, before anybody leaps to that assumption and accusing me of being a southern whatever.
The reason most people have a negative view of parts of "The North", or anywhere else for that matter, is mostly down to negative press. They don't tend to give you a tour of the local museum, fine dining, excellent universities, nice shops and cultural heritage gems in a news report about rioting, stabbings, flooding, cultural disharmony, snow and pockets of deprivation. You don’t see the good bits, well not unless somebody is trying to light it on fire at that moment. Who can truthfully say they always Google every place for background when reading the news. I sometimes do but not often. Positive things about any area rarely make the national news.