Alright, short story..
start mission in public session, select auto-invite. first to join is a guy in a crew i just join, i think "ok getting to meet the peeps" wait to see if anyone else from session joins..
one of the names with invited next to them suddenly has "blocked" next to them and suddenly i get the "you have been kicked by other players message"
i'm sure it wasnt the guy already there and wondering if it was due to the one that was "blocked" but either way when i got back into online i also got a badsport warning for leaving the mission, which had not even started yet.......