I used to get complaints all the time. "Your wife yelled at me". I started initially chewing her ass. Then, I realized that she never ever ever raises her voice (yells) unless telling the cat to get off the table. So I changed my approach. "Your wife yelled at me". Oh really? Did she raise her voice? Did she berate you in front of others? "Well, no". Then what dumbass thing did you do that caused her to fear you would kill yourself? "Well, I only.....". Now, I'm glad you came in to complain, cause I'm about to really yell at you,
I agree with the above posters. Yelling is subjective, and if you didn't witness the "yelling" first hand, you have no idea what really happened. I see so many people with their little feelings hurt for being yelled at when no voice was raised, no public berating took place, and all that really happened was that a dumbassery was exposed. In fact, in well over 20 years of being an instructor, I don't think I've ever heard any instructor ever yell at any student no matter what shenanigans they pulled.
I think your "yellees" may have been making it up.