Not in my world he doesn't as a confessed Red Bull hater, totally biased.
As for your question, the only negative comments I've heard has come from Helmut, but this is only via the media. From what I've heard he was summoned to meeting by Christian and told what that Perez was going to be retained.
Interesting, that is very much a "playing the man, not the ball" argument..
Ok, so clearly you are not working with the full information. Here are just some of the examples:
July 19th Hungarian GP FP - Horner
"I think he's been in a bit of a headspin the last few races, but hopefully today were the signs that he's coming out of that - and the team are working very hard with him to support him and make sure that he does re-find his form, because we desperately need it
July 19th Hungarian GP FP2 - Helmet is asked to confirm if Perez has performance clauses in his contract that can be triggered by the summer break
"There are various forums of performance clauses and, ultimately, it doesn't matter what a contract looks like, you just have to perform" "We'll have a look at the two races then we'll sit down together to decide what and how things will continue after the summer break"
Additionally, when asked about who is his fave amongst DR/YT/LL to replace Perez
"That was a nice question, I will give a nice answer; everything is open
July 19th Hungarian GP Post-Qually - Horner
"I think I have shown him that I am very patient. but this was really the last thing he and the team needed. We now have to get everything back together, repair the car and see what we can get out of it during the race"
Additionally when asked about Perez's future:
"Any discussions we have with him will of course tale place internally and not in front of the media. But of course, we can't run on one leg"
July 24th Hungarian GP Post-Race - Helmet
It was a typical GP weekend for Perez; unpredictable. he continues to have this up and down, nobody knows when he will shine or when he will make a mistake, he simply lacks consistently good performance"
July 26th Belgian GP FP - Horner
"Checo's future is in his hands. He has to have a good weekend, because we need his points for the CC and Mclaren has recovered a lot in the last races"
July 26th Belgian GP Pre-Qually - Helmut
"Sergio knows that for the CC we have to have both cars ahead of Mclaren if possible, and that hasn't been the case in the last few races"
Additionally when asked to set a specific goal for Perez, Helmut refuses:
"No, the goal is to win both the DC and CCs, and we'll discuss the best way to achieve that on Monday" (29th)
July 27th Belgian GP Post-Qually - Helmut
"But it is great to see Sergio, who has really improved. He will start on the front row to the relegation and now things are looking much better again"
July 28th Belgian GP Post-Race - Helmut
"Sergio had the opportunity to achieve a good result from second place. Unfortunately that was not the case. Specifically in the last stint, he completely collapsed, driving 1:48 times. What looked so positive in qualifying unfortunately didn't come true in the race