Williams accompanied his post along with the original picture he posted and the notice he received from Instagram saying that the content he posted on the social media site "infringes or otherwise violates" the rights of a third party.
Fans supported Williams, with some calling out the person who reported the post as "bigots".
"That was amazing to see before the match - unfortunately the bigots are out in full force," said one fan.
"@instagram I think you need to review this decision," said another. "Clearly the people reporting it are bigots using your report function to bully another user. Nothing wrong in this photo at all."
But an Australian journalist claims to know the the real reason the post was pulled: copyright.
"I have confirmation the professional photographer who took this picture complained to Instagram after his byline was cropped out,"tweeted Jamie Pandaram of the Daily Telegraph. "Fair enough."
Love your rugby? Subscribe now to NZ Herald Premium for unlimited access to premium content, including our exclusive, first-class rugby coverage. Check out our special rugby offer here