"It's the club and supporters I feel for," said Barton. "They don't get the chance to move club or switch alliances, they are left to pick up the bits.
"Lot of those within that dressing room have to have a good long look in the mirror. Spoke to a few of the better lads over the course of the season and it seems things just became ridiculous in the end.
"It seems an awful lot must change if they are to have any chance of turning it around next year. The club needs to change from top to bottom. I wish them every success in doing that.
"Believe it or not I am actually gutted for QPR - I reckon more than some of the current playing squad.
"If the media want to slag me off for saying players shouldn't laugh after they've been relegated, so be it. If I worked all week and paid to watch my team and I'd seen that. I'd be fuming.
"I don't care what level you play at. That's wrong."
QPR manager Harry Redknapp has previously admitted he doubted whether he could convince Barton to return to the club when his loan spell at Marseille finishes at the end of the season.
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