The German Host bigotry really has nothing to do with music authenticity in the first place. He's just hating without context and is probably one of the people who only knew Coldplay existed after Coldplay went pop.
I just need to add because putting Paramore in the same line as FOB seems incorrect. Paramore was kind of manufactured since start and their music was always supposed to be more pop-ish and radio friendly. Hayley Williams can say what she wants about being friends with her fellow bandmates since start, but reality is each of their founding band members were kids who were scouted and trained by major industry players. Unlike Coldplay, Maroon 5, FOB etc, Paramore were put together by their record label, they were never "a real band".
I wasn’t that into Paramore (was more of a FOB stan) but my friend was a huge fan of the former and she was one of those fans who didn’t like it when they released their titular album in 2013 and dropped more pop-ish singles like Still Into You which I actually liked. She was more into Paramore’s Misery Business era and wasn’t happy with their change which did help them become even more mainstream than before.
Regardless of how the band was put together, fans and music listeners alike still criticised them when they went down the GP-friendly route.