Interesting. I've ran into 2 people who did something similar to me. I was mining and suddenly these 2 people who were nearby started to follow me. I went on my business and stopped after a minute or so and tried to teleport away and one of them opens a trade with me, canceling my port. I tried to teleport again and the same person traded me once more. Annoyed at this point I said, "what are you doing?" and they backed off.

This was a little strange, but maybe they thought I was a mining bot or something for whatever reason.