Sulking is a human trait in someone who is too used to getting their own way and is a way of showing they are not happy with the current situation. It is also an anti social form of manipulation.
It is a nasty little habit often seen in spoilt children who go on to become spoilt and sometimes selfish adults.
I found in children the cure is simple, do not banish them to their room or tell them to go away and sulk somewhere else.
Sit them down within your sight while you get on with whatever you are doing. Ignore them while they continue to sulk and do not allow them to do anything while the mood continues.
You are attempting to instil in their mind that sulking is an anti social habit associated with boredom and won’t be tolerated.
Children need to learn that anti social behaviour is wrong and they cannot expect to get their own way all the time. All too often busy parents fall into the trap of giving in to a sulk or worse a temper tantrum neither of which are acceptable in society.
Think of how grateful the future friends and potential partner of your child will be to you in the future. There is nothing worse than a sulking husband or wife....