It may be difficult to meet a hurdle today, so ask and give some concern.
It may be that he was too spoiled and used to it since he was a child, and unconsciously let his emotional intelligence be fixed on his parents' efforts. This is natural. Now, when parents grow up, they lose the opportunities they got before and become angry from embarrassment.
Perhaps the angry parents are not as rich as other parents' financial strength and power, unable to support him and ruin his future, or resent or despise his parents and take it out on them.
Have a heart-to-heart talk first and talk to him with respect, instead of telling him what to do like a child. Give him principled care and encouragement, not doting.
If you learn from him again, you will lose your temper with him, which is worse than him.
Finally, if one or two fail, sue, sue for abuse.