I wouldn't call hootie a "rock" band either.
Pop rock is rock.
The Beatles, Jerry Lee Lewis, Chuck Berry, KISS, Van Halen, Bon Jovi, Buddy Holly, Everclear, No Doubt, The Cranberries, Def Leppard, and Maroon 5 are all Pop Rock bands.
Unless you look at the ACTUAL meaning of the term POP Rock.
Since it means POPULAR Rock, you can include bands like:
Radiohead, Muse, Metallica, Slayer, Pantera, Weezer, Nickelback, Korn, Nirvana, Pearl Jam, Perfect Circle, and pretty much every band that can be considered to be "popular".