1. Its not great, its not bad
2. Pretty Open
3. You get made fun of for it, you don't lose friends over it. At a certain age a lot of these things are trivial.
4. It has become much more mainstream and accepted. As long as you aren't a weirdo, you'll be fine.
I'll just say, in Australia you will meet all kinds of people, but one thing is to note is that, acting the way you usually do isn't always the best idea. It's good to have different personalities.
Also, even in the state of Victoria, racist jokes and mocking is very common (at least in my generation). Racist banter is something you would have to get used to and embrace, I participate in it as well.
If you like things from other cultures to an extent, you'll be associated with it, and it'll be considered a strange part of your personality.
Though the funny thing is that, if you're female and a weeb, it's considered normal;
If you're male and you're a weeb, thats something to poke fun of.
So it really depends on how you take things, I don't view all of this as very negative, its something I've grown up with and will continue to live with.
I am not fully aware of your situation, but to everyone reading this, don't be a dumbass; think for yourself. Know when to stop yourself from engaging in strange things, but don't sway easily to the expectations of other people.
It's generic, but being yourself (in this case a weeb), is less weird than coming off as 'trying to fit in'