The reason for the question comes from comments I heard made at previous meetings about a guy who had joined AA after 4 years sober - a lot of quite nasty stuff, suggesting he was not alcoholic and had ulterior motives for joining a recovery group at that stage of his "claimed" sobriety? To be fair he was quiet a strange dude but I'm not sure he deserved the comments that were made.
Were it me, I'd go to AA with no reservations. I'd also go to another group, if possible. I've never heard anyone "publicly" question a person's attendance in an AA group. Many are court-ordered and forced to go, true. But, the point of doing so is that hopefully they will determine that it is where they need to be in order to maintain sobriety. I have to remind myself daily...strange dude or not, everyone deserves the right to be sober if they choose to do so.