Yeah, interesting coming upon this ol' thread on language discrimination - from a job-fit angle...
Off at a tangent, I'd agree that it's an ODD biz-ness this sometimes BLURRY definition of who's "local" or not.
Many teenagers I know, moved across here with their families from Guangdong (Guangzhou, Foshan, etc) about 6-10 years ago. And whenever the talk is about "mainlanders", e.g. heavily-pregnant mothers using HK hospital services at the expense of "true"(?) locals, and some skipping payment after getting their babies the much-sought-after birth certs, it's obvious they feel uncomfortable when others, HK-born OR who've just been in HK longer, start negatively whinging on 'bout these "free-loaders".
BUT, as pointed out, HKers are made up of those from UP North of the border AND elsewhere...
Weird, shifting senses... just whenever it suits a group, at whatever point in time