Lotus driver Grosjean has been involved in numerous first-lap incidents this season, and was banned for the Italian Grand Prix at Monza after taking out Lewis Hamilton, Fernando Alonso and Sergio Perez at the first corner in Belgium.
He was once again at fault here as he hit the right-rear corner of Webber's Red Bull as the field funnelled through Turn 2.
The impact sent the Australian spinning onto the infield and destroyed his chances as team-mate Sebastian Vettel took a dominant victory to capitalise on Alonso's first-corner exit.
Webber eventually recovered to finish ninth and pick up two points, but his failure to score big has hurt his title aspirations, leaving him 60 points behind Alonso, and 56 adrift of Vettel, with a maximum of 125 available.
Webber did not hold back as he spoke to reporters in the immediate aftermath of the race, suggesting Grosjean should receive another ban.
He said: "I haven't seen what happened at the start but the guys confirmed it was the first-lap nutcase again, Grosjean.
"The rest of us are trying to fight for some decent results each weekend but he's trying to get to the third corner as fast as he can at every race.
"It makes it frustrating because a few big guys obviously suffered from that today. Maybe he needs another holiday."
He added: "He needs to have a look at himself obviously. It was completely his fault. How many mistakes can you make, how many times can you make the same error with first-lap incidents?"
Red Bull boss Christian Horner echoed Webber's comments, and believes Grosjean needs to take a long, hard look at himself after his latest first-lap collision.
Horner said: "I think that is the seventh incident he has had this year, he needs to really talk to himself or his team need to talk to him because not only is it dangerous for others, he has cost himself and his team a colossal amount of points, together with the number of innocent victims he has collected en route.
"At this level it is unacceptable to be having so many incidents.
"I think Mark has every right to express his feelings, it was a complete misjudgement.
"The most important thing when you make a mistake is to learn from it but this was a repeat incident."