No one hates Bournemouth because Bournemouth (whilst a cracking night out with a brilliant beach) is synonymous with old ladies and tea. They’re Just tin pot....and they know it.
EVERYONE calls it that except for some pedants on here who don’t realise that someone built a stretch of Motorway in the past 30 years.
Does it matter what neutrals call it? I’ll always call it “Palace” and I know some of them call it “Brighton” we all know what it means.