It was another tough weekend for Perez, who finished only fourth at Barcelona.
Perez was eliminated in Q2, while his Red Bull teammate Max Verstappen dominated the race from pole position.
Rosberg – who worked as a pundit for Sky Sports in the UK – asked Horner the following question about Perez’s performance.
“You just said he had a good race but I thought it was a lack of performance, especially during the first part of the race,” Rosberg asked.
“Isn’t that true? I mean, compared to Max, there were some laps where there was quite a gap.”
In response, Horner pointed out that Rosberg has been a “critical type of guy” since retiring from F1 at the end of 2016.
“You are a critical type, aren’t you?” You are tough on these guys. Now that you’re out of the car, you have to criticize all the guys.
“I think he (Perez) lost in the early laps and didn’t get off to a good start. George managed to get away with it coming off the track without receiving a penalty for that and I think that’s what he did. was the difference in the end.
“Checo’s race was getting stronger and stronger and that last stint in particular, he was coming back really strong, but not enough laps to fight for the podium.”
Perez is now 53 points behind Verstappen after seven races.
Horner believes the growing gap in the championship should ease the pressure on Perez.
“I think if you look at the points now, there’s a big gap between the two,” Horner explained.
“If anything, that should take the pressure off him. He has nothing to lose now and he just needs to relax, he can breathe and ride like we know he is capable of, like he did in Azerbaijan and in some of the early races This year.
“I think today was a good recovery on his part and it will give him confidence as we head to Montreal.”