Barton, who is on loan at Marseille for the season, made his comments after Rangers were relegated with Reading following the 0-0 draw between the teams at the Madejski Stadium.
The 30-year-old singled out Jose Bosingwa for criticism and opined the club were in danger of free-fall, amid his expletive-ridden tweets.
"I can't believe QPR have just been relegated and Bosingwa was walking down the tunnel laughing," Barton stated on Twitter.
"Embarrassing. Show some guts man. Some good lads but not enough. Too many maggots.
"Hope they can get a load out, if not they'll end up in a Wolves situation. League table doesn't lie. Both sides haven't won enough games to deserve to stay up.
"Reading in a better position than QPR though."