Sebastian Vettel hit out at Lewis Hamilton for unlapping himself during the German Grand Prix, calling the McLaren driver's actions "stupid".
Hamilton was a lap down after sustaining a puncture on debris early in the race, but was going faster than leaders Fernando Alonso and Vettel having just pitted for fresh tyres.
The McLaren spent a while between the first and second-placed Ferrari and Red Bull, while at the same time Hamilton's team-mate Jenson Button was closing in on Vettel.
"That was not nice of Lewis. I don't see why he was racing us," said Vettel. "If he wants to go fast he should drop back and find a gap. It was stupid as he was a lap down."
He added: "If you want to go quick and you have no chance to win the race you should respect that and use common sense. I didn't expect him to attack because I didn't see the point, and then I was surprised when he was side by side."
Vettel reckons the delay he incurred battling with Hamilton was critical in his loss of second place to Button in the subsequent pitstops. The Red Bull later regained the spot with a controversial late pass.
"I think that [Hamilton battle] lost us the place to Button because shortly after that we pitted," said Vettel.
Alonso acknowledged that Vettel's dice with Hamilton had been handy for him, and that he would have swiftly let the McLaren past if necessary.
"I knew that if Lewis was close enough with the DRS and trying to overtake, I had no problem to leave the space," said Alonso. "I knew he was not in the race. We didn't want to risk anything. For me it was a good position to have Hamilton between me and Sebastian.
"Having Hamilton there it meant Sebastian was 2.5s behind approaching the pitstop, so I tried to keep Lewis there."
Vettel also felt his Red Bull was not quite quick enough at times in the race, particularly when in traffic.
"Overall the pace was there but it was extremely difficult," said Vettel. "When we were close to Fernando and to Jenson we lost a lot and it was hard to stay close to try something under braking. That seemed to be the problem.
"I'm not entirely happy, because I think we could have been a bit better if we were in clean air for most of the race."