Dave has a well-earned reputation as one of coolest, nicest human beings on the planet. There is a video of him on YouTube where he lets a kid who looks like he's getting crushed by the crowd at a Them Crooked Vultures show and his dad out danger and allows them both to watch the show from next to his drum kit! He also managed to get John Paul Jones of Led Zeppelin to play in his band. There isn't a celebrity I can think of who I admire and respect more than Dave Grohl.
I have heard that Dave is awesome as well...but are you sure he didn’t just want to bang you?