In this 2nd post, I compile every good snippets I found on the internet and this thread, which has inspired me. Of course, you can make use of it too. I will update this as I go. 
1. What makes a good teacher?
- Great teachers set high expectations for all students.
- Great teachers are prepared and organized.
- Great teachers engage students and get them to look at issues in a variety of ways.
- Great teachers form strong relationships with their students and show that they care about them as people.
- Great teachers are masters of their subject matter
A mentor is a teacher; a skill that can translate to becoming a real teacher. As such, I feel it's good to at least point this one out because this is applicable in FFXIV as a mentor.
2. A good example of respect
Generally speaking, I have only had one negative interaction with a Japanese player, which was still nowhere near as rude as the stuff I regularly see on here. 10 out of 10 times I am annoyed with other players, they turn out to be English speakers. Japanese players never spam /shout with meaningless shit, they take their personal conversations to /tell. Everyone is polite. You always start duty runs with a "Please look kindly on me" and end with a "Thank you for your hard work". I'm constantly amazed by how nice people remain even after wiping to a fight five times.
Just tonight, for instance, after our third Susano EX wipe, our tank goes "I have no face to show (i.e. I feel ashamed) for my shortcomings." And everyone else starts chiming in, "Oh no, the mechanics are really punishing, aren't they?" "Please don't take it to heart at all!" "If you start to stress out, it'll just get harder to do the mechanics." I've been in plenty of parties where multiple wipes happened, and not a single time has anyone insulted or called out another player. From what I see on this sub it looks like calling someone else shit, insulting their DPS, telling someone to fuck off or try to kick them isn't out of the ordinary at all. :/ I love playing with the JP community, so much so that I wish everyone else could experience what it's like having such a positive community too.
This is essentially the words "Yoroshiku onegaishimasu" and "Otsukaresama deshita" coming out of Japanese players, a simple greeting and a simple thank you or good job means a lot. Showing admittance for doing mistakes is also a good way to let everyone know that you're aware of your mistakes and wishes to forgive everyone for it. We even have a /grovel emote, which I think is an amazing emote.