There are very very nice people and there are very very horrid people.
There are young kids playing all the way up to grown men, each with their own idiodyncrasies.
There are educated people and uneducated people, lazy, scammers etc all playing.
What makes it worse is that there is very little consequences to their actions. They can say what ever they like to whomever with out come back.
That is when the true nature of a person can be seen.
Just be yourself and deal with people as you think is right. If necessary try and join a guild, and you will be more or less shielded from a lot of nonsense.
A few points you mention OP
I have seen some ask "can someone explain the crew system to me" And the someone told him to check the Codec. That makes sense, as it would take a long long time for some to explain all the stuff related to crew skills in general.
With regards to Pvp in MMOs, there are two type of groups there are random groups where there is basic cooperation in the team play and there are "pre-mades" where there are voice comms or at the very least a coordinated way of playing.
More or less people are helpful and you will notice this the older the game becomes.
Another option is to play on a RP server where the immature people tend not to go, lol since they simply dont have the patience!