Unfortunately an inwardly-useful label may backfire outwardly, and vice versa.
Example: I have ADD, though I am currently managing without any medication or therapy. The label itself is useful to me, as it reminds me that I have legitimate reasons for working around my limitations rather than trying to bust straight through them. To other people, though, the label may seem like I'm making excuses or trying to come off as 'special', especially if I proclaim it loudly at every turn, which I really try not to do.
Another example: I agree with many tenets (aside: 'tenets', not 'tenants', DAMMIT) of Objectivist philosophy. Labeling myself an Objectivist, though, would be pointless, as I gain nothing inwardly from the label, and outwardly it would be more misleading than not.
I'd develop this further, but the baby calls. Hence the nanopost.