Looking at the billboard I can see where some posters would be offended. On the other hand I see where some posters are wondering why anyone would be offended. This is a superhero movie and the heroes usually have violence heaped on them, male or female.
Topics like these make me wonder what's the purpose of having female heroes onscreen and starring in their own comics if there's no violence whatsoever because it would be deemed offensive to some. Might as well avoid having females star in comics or movies in general to avoid all potential controversy.