Williams is now on loan with Norwich City, who were demoted from the Premier League in recent weeks. Following their thrashing at the hands of West Ham at the weekend, Williams decided to post an Instagram story with his middle finger raised with the caption "Easy up @NorwichCityFC."
The on-loan defender quickly erased the message, but supporters quickly screenshotted it and shared it on Twitter, as seen below.
Norwich City, according to The Athletic, have launched an investigation into the post. Williams also posted a photo of his dog, implying that supporters had followed him home, as shown in the image below.
The Athletic also reported that during Norwich's game against Aston Villa last week, fans raised a banner requesting that Williams stay at the club beyond his current loan term.
Williams has every right to be furious if supporters have followed him home as he has intimated, but posting an Instagram story like that can only get him in trouble, and Manchester United may not be pleased to see one of their young players acting in this manner.