The information is so true though even if it's being made fun of:
Post-grunge (also known as Post-grunge rock) is a subgenre of American alternative rock that emerged in the mid-1990s as an offshoot of the Seattle grunge movement.[1]
It is characterized by its radio-friendly style, distorted but often simple guitar riffs, and "soft verse, loud chorus" song patterning.
Post-grunge is often characterized as being less "dirty" and having a more mainstream sound than other grunge subgenres. Some believe that the entire subgenre was actually created by music label executives as a way to repackage grunge as pop music and market it to mainstream audiences. This directly contrasts with the original "anti-corporate rock" ethic that had spawned grunge music during the late 1980s and early 1990s. Thus, many grunge fans revile post-grunge and denounce these bands as sellouts. Traditional fans of the genre may criticize post-grunge as being derivative music that merely copies the influences of older bands, rather than creating genuinely new musical ideas. The band Creed, for example, is often derided as a knockoff of Pearl Jam or Alice in Chains.
Overall, the rock music from the mid 1990's to the early 2000's, including pop punk along with post-grunge, has been widely criticized as copying earlier genres while adding little original artistic input. The umbrella term "nu rock" has been used to describe these homogenous and somewhat porous bands and subgenres.
