Kyle Busch took several shots at Newman, who earlier in the week learned this would be his last season with Stewart-Haas Racing.
"I really hate it that Kurt got tore up and I felt like he had the best car here today," Kyle said to ESPN of his brother, who led a race-high 102 laps. "He was definitely good. He could definitely roll the long runs for sure and I was proud of those guys, but man just stupidity.
"I mean Ryan Newman is the biggest stupid idiot out here. And he's a big ogre and he can do whatever he wants because he can probably kick anybody's butt, so no sense in getting into a fight with him. But glad he is out of a job."
The incident occurred on lap 226 of 302. It turned a potential win into a 31st-place finish that dropped Kurt from ninth to 14th in the standings.
Kurt didn't mention Newman after the incident, but said he got hit from behind. The driver behind him was Matt Kenseth.
"It was three-wide action and everybody is going hard," Kurt Busch said. "We had a great car, which was capable of winning this race. But once again we didn't have the finish worthy of our performance.
"We took a hit in the points, but we're still in the Chase hunt. That's the good news. But we need to have more consistency and can't have these kinds of finishes with only seven races remaining before the Chase."
Kenseth blamed Busch for the incident.
"Kind of lost our track position when Kurt cleaned out Newman,'' he said. "I had to stop to miss that wreck.''
Newman, who finished 39, said Kurt took himself out.
"I guess [Kenseth] had a little influence on it," Newman said. "We were kind of in a bad spot having a little bit older tires. ... Just a lot of disrespect from a bunch of guys on restarts. What comes around goes around."