Instead, Sexton was the player under fire as the veteran number 10 milked the tackle.
Reacting to the incident, one fan wrote: "Sexton play acted a head injury. Blatant cheating."
A second wrote: "That Liam Williams yellow card shows why rugby will be dead in a few years - nothing wrong with Liams body shape and Sexton play acting sums up how rugby has drastically changed for the worse. It's a mockery to the real injuries."
Another commented: "Sexton winks after getting another fellow professional a card by his simulation of injury and as always gets up to take the resulting penalty. This will destroy the spectacle that is International rugby."
A fourth said: "Another football injury/tactic from Johnny Sexton. He does it too many times."
Another wrote: "This is some pretty poor rugby from Wales. But Sexton selling the head injury is low."
Williams tackle on Sexton:
Wink from Sexton:
COMPETITION
4 players who flopped in the opening round: 2023 Six Nations
We take a look at five players who failed to perform in today’s 2023 Six Nations action.
#1. Owen Farrell (England)
RUCK 4/10: Aside from being poor from the tee, his defensive positioning at centre cost his side more than once.
Planet Rugby 6/10: "Kicked poorly off the tee."
Telegraph 5/10: "Not his finest performance in an England shirt. Clattered into Russell slightly late in the first half which was met with approval from the Twickenham crowd - tackle school has been treating him well. Patchy from the tee."
#2. Dan Biggar (Wales)
Planet Rugby 4/10: "A poor day at the office for the fly-half. Outplayed by Johnny Sexton, whose decision-making was far sharper. Improved in the second period, but he won’t be happy with his efforts on Saturday."
RUCK 4/10: Lack discipline or any structure to his game. He was a big reason why the Wales attack misfired."
#3. Maro Itoje (England)
Maro Itoje of England during the England Captains Run ahead of the Guinness Six Nations at Twickenham Stadium, Twickenham, London on Friday 3rd February 2023 | Photo: James Fearn/PPAUK.
Planet Rugby 5/10: "Once again not his usual presence on the field. Scotland marshalled him pretty comfortably. Under threat of getting dropped?"
Mail Online 6/10: " Better than the autumn but still not back to the old Maro"
Telegraph 5/10: "Had a quiet first half by his standards. Produced a number of crunching carries and was a key player in helping patiently build the phases that led to England’s opener. Showed flashes of the disruptive force he is capable of being at the lineout."
#4. Taulupe Faletau (Wales)
Planet Rugby 4/10: "Glimpses of his excellence in the second period but one of the bigger transgressors on the discipline front."
RUCK 4/10: "Three missed tackles and three handling errors. Probably his worst game ever in a Wales shirt"
Rgoo"Strong defensively but the Welsh back row was bossed at key times by Ireland’s breakaway trio."
Not an inspiring game as a Welsh fan, but there’s a decent #Wales team there somewhere. Midtable is an okay result for the #6Nations2023 in my view. Eyes on the #WorldCup. Pity Sexton felt the need to push for the yellow, especially given the score line. #WALvIRE#SextonWink
Drop either smith or Farrell or both and Mitchell in for Youngs . Still too many players picked on reputation not form. I used to love Curry and Itoje but I wonder if they are slightly burnt out and do give away a few penalties.