You can see how the poster looks on the buses in the post below.
It may also be the combination of the disrespect of the near-nudity and the addition of the ring that is upsetting people, too.
According to a post over at Le Figaro, vandalism on buses in France has actually gone up since the Amazon poster has been added to the lineup of ads currently on transportation vehicles, though the outlet notes that there is nothing specific to link the buses that were targeted to the ad.
Still, bus drivers in France have protested the inclusion of the Borat 2 poster on Twitter and it very well could go down in history as one of the many banned movie posters over the years.