Does anyone feel as I do about the phrase 'fair enough'? It's meant, of course, as a neutral acknowledgement, but it always has a faintly passive aggressive air to me. Whereas 'that's fair,' serving the same purpose, sounds much more genuinely conciliatory, somehow.
I don't have a problem with "fair enough". It's like, okay, we've crossed a threshold where we no longer need to argue, so we can leave it here and maybe talk about something more pleasant.