Generally speaking, if you want to be a truly generic pilot, you could ensure you do not end up with any kind of tag, and only use civilian ships or ships that are considered totally 100% neutral by everyone (like the pirate transport). If you use Corsair ships, the Outcasts will hate you. If you use Outcast ships (or their allies ships), the Corsairs will hate you. If you use lawful ships, you'll be sanctioned for improper ship usage, most likely.
So if you truly want to be a generic pirate, use the above ships I mentioned, the Pirate ID and no tag. Oh and don't shoot any fellow pirates. You might still get engaged if you wander into areas you're not wanted however (such as Chugoku, Guard systems, Alaska etc), so you need to be careful and bear that in mind as well. Life is hard for an independent, unaligned pirate, as it should be. You have no friends to rely on (because if you start treating anyone favourably, their enemies will start hating you) and quite a lot of enemies.
I would only use Zoner bases, Junker bases and IMG bases such as Freeport 4 to land at. You shouldn't land at any other pirate bases unless you have a specifically signed agreement with the appropriate controlling player faction (otherwise they might just decide to shoot you). And you should always be aware that even making such an agreement will leave you open to being engaged by the enemies of that faction. So best to be aware of any consequences.