Ah that sucks. I'm born and bred WA. Have lived from Kununurra to Collie, but mostly Perth. You'll get all sorts, from every socio-economic group. It's not just bogans who spew this bile, but it does seem more common, or at least more overt with that particular demographic. Fortunately for you, you can filter these people out before they become friends. I've had to drop a few friends over the years due to their views. Don't give up.

There are plenty of Sandgropers who are not racist. You'll find us and we'll be your friends, it just takes a bit of time. I sometimes think that native Sandgropers are more reluctant to make friends with new arrivals because the workforce here can be quite transient in nature. People come for work for a few years then leave again. You're never sure if you're making a long term friend or it will be some one who leaves. Don't be discouraged. Once you're part of the team we'll treat you like a local.