In the shoplifting thread there was debate as to whether stealing from nonjews is theft
There was no such debate.
It was unequivocally agreed (as per explicit Gemaras to this effect) that stealing from non Jews is prohibited. The discussion was whether there is an obligation to return a stolen item when stolen from a non Jew, which seems to be a debate in the Poskim, and depends on the exact classification of the prohibition to steal from a non Jew.
If you don’t like the fact that a non-Jew can have different halachos to a Jew, there is nothing I can do to help you. If you want to deny the fact that non-Jew can have different halachos to a Jew, I can happily prove it to you.
I find it interesting how some posters feel the need to misquote or misinterpret other posts into something they can ridicule. This is a problem in posters of both extremes, unfortunately.