Samuel Umtiti's 51st-minute header saw France win 1-0 in St Petersburg , booking a spot in Sunday's final for Didier Deschamps' men.
Belgium struggled to create many chances after a bright start as they were left frustrated by a compact France outfit.
Courtois blasted Les Bleus – who moved into a third World Cup final – for their tactics.
"It's just an anti-football team," Courtois told Sporza .
"Their striker plays 30 metres from his own goal."
Belgium booked their spot in the semi-final by upsetting favourites Brazil in the last eight.
But Courtois said he would have preferred to lose to Tite's men, praising their approach.
No final it is— Belgian Red Devils (@BelRedDevils) July 10, 2018
That's #Football . We did our best.
The support in & all over the world was once again amazing !
Félicitations @equipedefrance et bonne chance pour la finale !
We go for now !
@Fanclub1895 #REDTOGETHER #WorldCup #FRABEL pic.twitter.com/OnLhIg0zoP
"France heads a corner and does nothing more than defend," he said.
"I would have preferred to have lost in the quarter-finals to Brazil, at least that was a team that wanted to play football."