Taylor Swift fans were quick to blame Dave Grohl’s cheating scandal on “karma”. RadarOnline.com can reveal Swifties ripped the Foo Fighters frontman to shreds after he announced he fathered a child with another woman outside of his marriage. The pop star’s fan base wasted no time ridiculing Grohl, 55, after he ruffled feathers earlier this year during a concert by insinuating Swift, 34, lip synced during shows. Swiftie’s relished in Grohl’s scandal after the former Nirvana drummer seemingly took a jab at the Anti Hero singer during a concert in London in June. At the time, Swift was playing a …