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by throwawayjava 2450 days ago
> What non-arbitrary rule should we use as a society to determine if a product/service can be targeted or not?

Actual past experience with specific, widespread, and demonstrably harmful discriminatory practices.

Widespread discrimination in housing during the 20th century -- and the negative effects that had on certain communities -- resulted in laws prohibiting discrimination in housing ads.

Widespread discrimination in employment during the 20th century -- and the negative effects that had on certain communities -- resulted in laws prohibiting discrimination in employment ads.

BTW, these categories also make sense. Housing (i.e., schooling) and employment have a huge impact on your life outcomes in the USA. Choice of hair product, not so much.