English is technically my second language. As a kid, I mainly only spoke it at home with my (English) mum. I never developed a regional accent and had RP instead. Other kids bullied me for it. In contrast, an English guy got angry that I was ‘parodying his accent’. Can’t win!
(I do recognise that RP is privileged in lots of ways, though. But it makes it tricky to negotiate your identity if you have education, work, or social life somewhere RP is uncommon.)