A common tactic used by evangelist partisans is to paint centrists as 'undecided' on some issues and therefore just as evil as the enemy.
In reality these people are as opinionated as any partisan on individual topics.
In the great Red-vs-Blue battle, I'm on the sidelines, because I'm on Team People, not Team Red or Team Blue. Both sides have positions that I agree with, and both have positions that I disagree with. I can't be fully on either team, because neither is fully on my team.
But I'll get involved on individual issues. I'm not "undecided" on individual issues.
Why is that a problem? (I mean, I see that it's a problem for someone who's wholly sold out to Team Red or Team Blue, but why should the rest of us care?)
That's a fair criticism. I suppose I was responding to the attitude I perceived from the comment rather than the words themselves. I'll admit that what I said may not apply to the GP at all.