These days things everywhere are looser then they were even 25 years ago. It seems that it’s OK to list things as casually as possible without any degree of correctness just to put some “spin” on them, maybe to enhance who you are or what you do.
I am not in this camp, however, and I try to be as scrupulous as possible about what I claim to have done and not done. If I write something with another author, it gets listed as “co-author”, not “author”. I don’t try to make it seem as if I wrote it alone. If I publish something, it is with the other authors’ names in order and what it is and isn’t is CAREFULLY noted so as to be exact.
If you take a course, one or even three courses, or if you take a few private lessons (less than one year’s worth of bi-weekly training sessions), the old “Code of Ethics” would not allow you to claim that you were the “student of” whomever it was that you saw. In fact, you cannot use “studied with” if you took a course, as that implies that you were a private student. You have not “worked with” or “worked under” for the same reason. You can claim, I took this course. I was given certification to say that I got the information from this course from this specific person. That’s not wrong. That is ALL you can claim. If you have been a student in a master class with a master teacher, you MUST list it that way.
Speaking for myself and others in similar circumstances to mine, I really do not appreciate it when someone who has seen me twice or three times, or who has taken one of my trainings, claims on his website or social media to have “worked with” me. Especially if I wouldn’t remember the person if I bumped into him or her on the street. I do not expect to see on social media that the person has “worked under or with” me. If you want to claim that you have a personal relationship to me, you have to actually have one.
You have to earn your own reputation. Young people, be aware, claiming to be someone’s student when you have not met the above criteria is borderline unethical behavior. True, it’s not illegal, but it is misleading. If I catch anyone doing this, you are going to hear directly from me and you won’t be happy.
The only people who can say they are my students are those who have worked directly with me, one-on-one, for a minimum of one entire year (on-going) or who have been involved in my coursework over a long period of time (several years). I’m watching.