No doubt the so cold passengers have a medical condition that should be treated, even though it might be very common.
If they were Happy with the Temperature, they wouldn't be so bundled up and still freezing.
The airline would go a long way to really helping them learn what is making them feel so cold and uncomfortable
After all it was the Japanese, who started Preventive Medicine back in the 1200's. .
Because of the 28 degree policy in the office and elsewhere they are simply used to being warm and find colder temperature, well, cold.
I see no point in reading any more into this and giving it a complicated medical explanation.