Weird.
Here, this is simply a nice gesture on my part in correcting you so you know. The aboriginals are the tribal people who've lived on Taiwan for millenia. A-Mei is the most famous one. Anthropologically they are related to malay-indonesians.
Hakka are not aboriginal they are Chinese immigrants from the 18th and 19th centuries.
An analogy to early US would be that Hakka are like, say, German immigrants compared to the minnan (Taiwanese speakers) who'd be like english or british. The aboriginals are like the American indians.
I wasn't and am not trying to criticize you in any way and the stop sign comment was meant to be in fun, if you thought it was some sort of slam.
If you haven't, take a trip to Hualien or Taitung.
As I re-stated, I am not an expert in this matter. I can only post that information as is current under the laws and culture of Taiwan.