English?" Just please be aware that, particularly for recent arrivals, it does grate a bit, and in a formal setting, many of us don't like it that much, and it is slightly loaded due to the aforementioned persistent negative usage (as much as we shrug it off), so please don't over use it. I like it when I go to a country town/Queensland) and a girl in a cafe will be all polite and say "Oh, I like your accent, are you a Po. I implore you not to stop using it, it's cute, it's funny, and it adds character. It's OK for a laugh, but don't overdo the joke. Now, yes, they're perhaps worse names, but that's how it feels. Think of the equivalent as being "Seppo" or perhaps if we called all the Aussies "Skippies" or "Convicts" all the time. Now, I know you'll say you don't mean it like that, but it just really grates, and feels rather sneery. It's not so much that it's negative, just that almost every time Aussies want to say something negative about the English, they'll use "Pom", so of course it's going to have negative connotations. Think about it this way, if you were being nice to someone in a formalish setting, would you call them a Pom? No. Don't want to seem like "a whinging Pom" now, do we? But then there's a pre-emptive defence, we're not even allowed to say we don't like it, for fear of being told we're whinging, and of course it makes it more likely that you'll use it! Here's a take on the whinging Pom - which I find quite accurate. You might ask your "Pommy" mate if he minds it, and of course, he'll say no. It really grates when journalists or presenters use it all the time.
If you're a mate and/or you're doing it conversationally, then it's honestly fine.
If you're doing it because you don't know any better, then that's alright too. If you're doing it on purpose to wind us up, then that's cool. I've lived here six years, and just thought I'd clear this up, from my perspective. Now, I don't know if a lot of people know this, but many English people really don't like being called Poms.