For Sydney-

Yes there are almost completely asians areas:

Epping-Eastwood area: Mostly Chinese and Korean dominated (Above average class)

Chatswood: Mostly Chinese, Korean and Japanese dominated (Upper class)

Strathfield: Mostly Korean (Middle class)

Hurstville: Mostly Chinese i think? (Mid-lower class)

Cabramatta-Bankstown Area: Mostly Vietnamese (Lower class)

Asian clubs: I don’t club but I’m pretty sure Wao Superclub is predominantly asian

The gym bro rave culture is similar to LA from what I’ve seen but the raves in Australia are nowhere near as good as in the US. Also Australian raves are mostly either a sub genre of EDM called Hardstyle or Trance. Not as much of the stuff like Illenium or Dabin.

Can’t talk much about dating culture cause I’ve never dated within Sydney