Do you have any idea what the latency is across the Pacific Ocean? You were probably ruining their lobby.
Go to Pingtest.net and ping Seoul (there's no Japanese servers to ping on Pingtest, so Seoul will have to do). Then read the last three paragraphs below.Apart from New Zealand, the latency for a signal from Australia to anywhere and back again is ridiculous. Sure, they could be less blunt about it but "Aussies Only, Sorry But Due To The Physical Limitations Of Our Universe And The Nature Of P2P Networking Systems We Can't Accept Foreign Drivers As It Makes Races Unplayable" doesn't really fit lobby titles. If you're not living in Australia, go to Pingtest.net and ping an Australian server - if you are, ping a European server.
Note that a ~50ms ping is the minimum you want to be at for a non-laggy race. The more players there are, particularly if the majority are clustered in one spot and the minority are in different territories, the worse a slow ping will be as your machine has to communicate with each and every one of the others. I'm just guessing, but I think the US-Japan ping will be ~150ms and the Australia-Europe ping will be ~250ms. Now imagine they're all playing in their 'local' lobby with 25-30ms pings and you show up with 150ms...
While I'm sure there's racists online and more than a few people don't want people who can't speak their language jabbering away in a foreign tongue (which is understandable, if not very friendly), the fact is that trying to connect to a lobby that is hosted very, very far away harms the experience of everyone in that lobby.
Unless the game moves to dedicated servers (which is an incredibly expensive way to do it, particularly on a multi-million selling console game) or the universe stops being so mean with its upper speed limits (which isn't likely), that's how it's going to have to be.