When u join in high-end contents like the savage raids, there will always be a minimum expectation for performance that is required of the content. While in the JP data centers they can be less vocal (well E players in there are much more direct lol) about under-performing players, they can-and-will voice out or even take action if the "exceptional" case becomes "truly exceptional" and might even affect the next non-j player that joins the party (got removed from a o11s party months back, can't remember whether it was ATC or farm, because the party leader had trouble with an E player the previous try).

That said, friendly players that help others are everywhere; had a grp of E players that took turns to switch to a tank to take aggro when BLU-ing for Final String, and a grp of J players that carried my fat butt 2 more extra rounds in Haukke Manor despite me being prepared to make another party so that I dun waste their time.