First, yes, apparently Smash Mouth is still around and performing concerts. The band made popular in the late 1990’s from hits “Sun” and “All-Star” was at the Taste of Fort Collins in Colorado over the weekend and things took an unexpected turn after an idiotic fan threw something at lead singer Steve Harwell.
Just as they were about to perform “All-Star”, Harwell became infuriated and began approaching the crowd, appearing to specifically point at an area of the crowd. He was held back by security before grabbing a mic and threatening to beat the piss out of them in NSFW fashion:
[Reddit]

About Jason Smith
Recent Posts
A’ja Wilson cementing GOAT status record by record
"I'm just truly grateful for every teammate I've come in contact with that has played alongside me for this 6,000."
‘I’ve been terrible’: Alex Bregman takes blame for Chicago becoming a White Sox town
"I need to be better with runners on base, plain and simple."
Geno Smith ‘cherishing’ return to New York
"I see a lot of potential in this team."
Drake Maye looking forward to Super Bowl rematch
"It’ll be something for us to gain some extra motivation."
Knicks complete sweep of Cavaliers in dominant fashion
"It's a magical thing."
Kenny Atkinson, down 0-3, insists Cavaliers are winning ‘analytically’
"I don't know if you guys follow that -- the expected score. We've won two out of three."