The Welsh national side shocked the footballing world after making it into the semi-final stage of the Euros by beating a team brimming with talent, such as the likes of Eden Hazard, Romelu Lukaku and Kevin de Bruyne.
They would end up 3-1 victors on the night, and while Wales fans appreciate all the support they can get, Cameron's congratulatory message was met with a concerted backlash.
Prior to the game, the Prime Minister tweeted:
PM: Huge game for Wales tonight at #EURO2016. You are doing the home nations proud - best of luck, we are all right behind you @FAWales #WALAnd like a true bandwagonist, he tweeted the following after the match was done:
— UK Prime Minister (@Number10gov) July 1, 2016
PM: Amazing performance, amazing result. Passion & pride shown by Wales team & fans are incredible to watch. Bring on Portugal! #EURO2016Suffice to say, some Welsh fans weren't impressed by his 'pretentious' message, and they let him know immediately.
— UK Prime Minister (@Number10gov) July 1, 2016
@Number10gov you're going home like the England team
— Darren Vaughan (@vaughan_99) July 1, 2016
@Number10gov Thanks, but we don't need a #BandWagon. #StrongerTogether #WAL WALES #WelshandProud
— John Richards (@johnniemojo) July 1, 2016
@Number10gov You don't care about Wales, stop lying.
— Viscount John III (@The_Extractor_) July 2, 2016
.@Number10gov Don't even think about pretending to support Wales; your lot haven't done so for the last 40 years.
— Dave Jones (@WelshGasDoc) July 1, 2016
@Number10gov Piss off
— Harry (@Harrybird94) July 1, 2016
Lo! the ghastly creep has pissed off. Good riddance to the slime mould. Apologies to real slime-moulds.