Dave Grohl drags Taylor Swift on stage in London

Does Taylor Swift lip sync? or does she use recorded backing tracks?
i don't pretend to know music all that well, or pretned to be a Taylor Swift fan. I guess i just don't understand the hate. there have been many less talented people who have been as popular over the years...
I've actually watched 2 of her concerts on TV and I gotta say, the production alone is miles better than anything I've ever seen. It's incredibly complex and the set elements are substantial and just pulling it all together, the band, music, scenery, performance and of course TS being the center of it all is pretty awesome. And I don't even listen to TS. I've never been a fan of her music, but I totally see why she's a superstar.