Child's feet on the back seat of an airplane... When warned, parents tell them to get psychiatric treatment (Korea)

It has been reported that a passenger who warned a child who was swinging his bare feet toward the back seat of an airplane was told by the child's parents to "get psychiatric treatment."
According to JTBC's "Case Leader" on the 23rd, the incident occurred on the 14th of this month on a flight from Shenzhen, China to Kuala Lumpur, Malaysia.
At the time, the informant, Mr. A, was sitting behind a child who appeared to be an elementary school student, and after the plane took off, the child came barefoot towards Mr. A's seat.
The child was swinging his legs up and down. A asked the child's mother to stop the child's behavior, but the mother did nothing. Unable to bear it, A ended up shaking the child.
The parents then got angry at A and said, "Why would you do something like that to our child?" and immediately took a picture of A's face with their cell phone camera. A was the first to be rude.
The reason is that A used dirty and foul language. In the video of the incident, the child's parents were filming A with their cell phones and asking, "Why are you using dirty words with your child?"
"I didn't use dirty words. I just said it was unreasonable," he said. The child's parents continued, "Why do you say you didn't do it? Get psychiatric treatment.
Don't take your frustration out on your child here," she said, and Ms. A protested again, saying, "Isn't it the parents' problem if they don't educate their children?"
Regarding this, lawyer Yang Ji-yeol said, "I don't know what happened before this, but
"The child's leg is the one being held down. Even if some foul language was used from the back seat, I think the driver should have apologized for not warning the child first," he said.
"If the child's parents did this even though they had not used harsh language against the child, it would be closer to 'insulting' as it was an emotional expression in a situation where others could see," he said.
Ta.