I opted out of showing the flag on my profile in previous forum formats. I also opted out of showing my gender, although I've freely disclosed information that makes both my gender and country of residence clear.
I prefer to opt out of disclosing that information on my profile. If someone wants to attempt to identify me, they can bloody well work for it, by reading through all of my 13,000+ posts, rather than having it automatically served to them on my profile.