Manly Warringah Sea Eagles forward Addin Fonua-Blake has sent Raiders fans into meltdown after he rubbed salt into the wounds of heartbroken Canberra supporters on Sunday.

Fonua-Blake waved to a portion of the 20,265-strong crowd and gestured as if to say "have a cry" following Manly's thrilling 18-14 win over the Raiders at Canberra Stadium.

Raiders chief executive Don Furner has slammed Fonua-Blake's antics as unsportsmanlike and fired up fans have had their say on social media.

Some say he is "classless" and one of the game's "grubs" - and those are among the nicest barbs thrown his way. Some just can't wait for the Raiders and Sea Eagles to meet again.

Fonua-Blake's exploits have been likened to Mick Ennis mocking the viking clap when the Cronulla Sharks beat the Raiders in Canberra during the 2016 finals series.

The ex-Sharks hooker has since been forgiven - partly because he is now on the Green Machine's coaching staff, and partly because punters eventually realised it was a bit of fun.

But Fonua-Blake? We can't see him joining Ricky Stuart's inner sanctum anytime soon.

Fonua-Blake was a standout for the Sea Eagles as he ran for 153 metres and made 23 tackles in the victory that put Manly back into fourth position on the NRL ladder.

Now we wait for the day they meet again.