There's a reason they recorded, what, 84 different mocking lines, so that there'll be a variety. (I mean, you could also just not use Vicious Mockery, but what fun is that?)
And when I played a bard in tabletop, trying to come up with different comments when I cast it was part of the fun.
And, to be honest, I'm willing to bet adding/changing/removing more lines to the bardic insult list is going to be a hobby for modders.
