Holy crap! No explanation, no consideration, just casual abuse.
It seems your position is that you're not willing to discuss anything contrary to your opinion and anyone who thinks otherwise is below you.
Are you sure you're in a position to judge others for how they think and act?
Problem with that is, is that I am not white. Maybe you'd like to consider your own casual racism here.
For me there has to be intent. The problem I have with seeing the word Jap as racist is that before WW2 the Japanese were considered friends of this country in terms of investment, intermarriage and they were allied with Great Britain in WW1 (even if it was with the aim of taking over German territories in the Pacific, which they did, which led to the Japanese invasion of China, etc.). Back then the term Jap was used and it was no considered derogatory.
Then we had the second world war and of course relations soured as badly as they possibly could and when people used the term Jap it was referring to an enemy. Over time the word Jap became associated with anger at the Japanese and rarely in Australia did anyone have anything positive to say so Jap evolved into a term of derision simply by association with anger at the Japanese for WW2.
Now, 70 odd years later younger generations have little to no knowledge of WW2 and the anger at the Japanese does not pass through to people 20 and under. That's not to say that these people won't be racist for any particular reason but the baggage that the term Jap picked up in the 1930/40s rarely rarely exists for younger generations today.
However, people like you, my indignant and internet-outraged Poodle, are now allowing the racists to decide what language we are allowed to use. People may have no ill intent at all when they use the term Turk (oh yes, remember WW1 when Turk was considered nasty? Are you even aware of that and do you get angry when people 4 generations later use the term Turk? I'd wager not), Aussie, Brit, Indo, Jap, etc. but you want to push the ill intent of others onto them regardless of how they intend to use it or how the other person receives it. You allow the racist people of the world to define our language, you empower them by maintaining their actions across generations.
It's like your little crusade - your internet crusade. Did you do anything about it when you had that experience? Were you as rude to him as you were to me last night? Or do you just reserve that kind of behaviour when you don't have to be accountable for your actions? I'd hazard a guess that you don't know how many Japanese people think of the word Jap. I'd guess that you don't know the history of they way Jap was used or the history of Aust/Japanese relations prior to WW2. I'd wager that you're just another new-aged and outraged internet warrior who's courage does not transfer to real-life convictions.
So thanks for the condescension and dismissal from a safe distance and thanks for not being able to explain the way you feel and have a decent discussion about important issues. I look forward to not reading your next hypercritical and flippant remark.