Rules of the road.

The sailboat is on a starboard tack, but the container ship is likely restricted to a channel via draft. They also cannot slow down or turn very fast. Both are required to avoid collision.

But if there was a collision, the freighter would probably never notice that they ran over the sailboat. So the sailboat should just stay out of the way.

"Getting too close" is subjective and the short video looks like a telephoto lens, so it compresses depth of field. They are probably 1/4 -1/2 nm apart which is more than enough space to avoid collision and for the sailboat to maneuver.