Ederson needed stitches in his face and ManΓ© will serve a three-match ban although Liverpool have announced they will appeal against the length of the suspension.
Former Manchester United and England star Gary Neville, who has highlighted the weekend's inconsistencies, also tweeted his bemusement at the Reid incident.
Neville suggested the All Whites defender, in his first match back from injury, should've been shown a straight red card, insisting that he had "endangered" MouniΓ© through the use of "excessive force".
Newcastle United supporters also felt aggrieved that Matt Ritchie had been shown a yellow card on Sunday for a similar challenge on Swansea's Alfie Mawson, although the midfielder admitted after the match that he had been lucky not to be shown a red.