Staind singer Aaron Lewis berated some members of a crowd at Kansas City's Rockfest Saturday after they started inappropriately grabbing a young female crowd surfer.

The rant was captured on video by a concertgoer and shows Lewis cut into the song "Something to Remind You" after noticing some people in the crowd getting a little too friendly with a female crowd surfer.

He then laid into those harassing the girl with a profanity-laced tirade. He pauses in the middle of the song and addressed part of the crowd saying, "All right, listen up you f--ing a--holes, that f---ing girl right there is like 15 f---ing years old, and you f---ing pieces of s--- are molesting her while she is on the f---ing crowd."

He added that the rest of the crowd should beat them up for their actions and notes that their mothers "should be ashamed of themselves." After finishing what he had to say, Lewis concluded with "Now girls, feel free to crowd surf safely" and then launches back into singing.

According to Billboard, the concert was put together by local radio station 98.9 The Rock and featured a crowd of about 55,000. In addition to Staind, Korn, Killswitch Engage, Steel Panther and others performed.