Um. Most of the posts on this thread are from back in 2018 when what passed for Autopilot was a lot less mature.
These days, but notably when passing to the right of cars on a controlled access highway, Tesla Autopilot/EAP/FSD will put up a pretty funny looking graphic on the slower cars and slow down while passing them; last time I saw this, it even put up a text message on the screen saying something about "safety" and "slower traffic".
I don't think I've seen it when I'm in the left lane and passing traffic on my right, but might not have noticed. I usually go no faster than the 5 mph over the limit, max, so the speed difference between me and everybody else in the "travel" lanes isn't all that much.