The population of Perth is predominantly made up of families with their roots in Western Europe. (Compared with other Australian cities, there have been relevantly few immigrants from south-east Asia). As Jno indicates, you're possibly more likely to hear racist views expressed in Perth than in other Australian cities. (These are more often directed against the indigenous, Aborigine, population than against immigrants). However, I doubt that there are any more people actually holding racist views in Perth than elsewhere. It's just that the citizens of Perth don't subscribe to 'political correctness' and tend to speak their minds. (For example, you're probably far more likely to be told 'a woman's place is in the home' in Perth than elsewhere in Australia but that's only because those people who believe it aren't afraid to say so). NB: I should make it clear that I don't agree with either the racist or sexist views!
As Jno indicates, Perth is a long way from anywhere. The distance to the nearest main centres of population is roughly the same as from London to Morocco.
Cities like Adelaide are pleasant enough but, for me, they don't come anywhere near to matching up to the delights of Perth. Away from Perth, the city dwellers are much the same as anywhere else in theworld and you lose the feeling of 'true' Australia. For example, I met a couple from Sydney at a wildlife reserve near Adelaide. They were in their fifties and were overjoyed that, for the first time in their lives, they'd just seen a kangaroo. For the residents of Sydney (and most other Australian cities) kangaroos are only something you see in zoos and reserves. For the citizens of Perth, they're a daily traffic hazard!
If you want the security of a familiar lifestyle, go to Southern Australia. If you want an entirely new, mind-blowing experience, go to Perth.
Chris