Miranda Lambert and Anderson East Share Their Opinion on Garth Lip Syncing

Anderson posted this on twitter and Instagram and Miranda commented:

"High five on this babe. If you can't sing then don't. It's better to be honest than to pretend. I think it's [BS]. My favorite performances in the show were live live. The truth"

What do you think? Is it okay for artists to lip sync in certain situations, or should he have cancelled his appearance?