Mark Warburton called QPR’s first-half performance “totally unacceptable” after they were beaten 3-1 by his former club Brentford.
Rangers’ defensive shortcomings were evident yet again at Griffin Park, where the home side were three up by the interval.
“We had a few heated words at half-time, it’s fair to say,” Rangers manager Warburton said.
“We lost duels, didn’t do our jobs at set pieces and could have been four down. That’s totally unacceptable.
“As a group we had some words and you saw a much, much better second-half performance.
“But we can’t give ourselves a mountain to climb by playing that poorly in the first half.
“We knew what they were going to do and we didn’t do our jobs. You have to do your jobs.
“You can talk about tactics, formations and techniques – it’s irrelevant. You do your job. You show character and show a bit of bite.”
Warburton made a substitution at half-time, taking off Dominic Ball, moving Geoff Cameron into midfield and bringing Conor Masterson on for his league debut.
The change made a positive difference, while youngster Masteron did well at centre-back.
“I was pleased with young Conor when he came on. He did well and I thought in the second half in general we were much better,” Warburton said.