I feel like what's discussed here is more controversial than taboo. It's similar, but slightly different.

While Whiteboard interviews might be controversial, I wouldn't consider this taboo. Making jokes in the workplace about women however, would be considered taboo. Even though this may have been considered 'acceptable' just 15 years back.

It seems like the difference between the two is one of opinion vs offence. While having a different opinion is fine, raising offence really depends on how much backlash you get.