traditionally, men are bread winners and their scope is outside house and women are house keepers and look after children Mahatma Gandhi also viewed so. Hence, men are less involved in household job. As the perception is changing, we may see reversal of trend.
Men don't have much patience. So they wont have much interest in doing house hold activities. and another reason is... from earlier our elder has followed a tradition that women should be at home and men should go out and work.As you said present generation men and women are equal but the tradition has been continued as it is.
But in some families , men understand women's hard work so they help women in house hold activities
I agree with sarala that thinking is like that and said by gulshan ji from olden days men are meant for outside work and women for house hold work. But both should participate equally for better understanding. Like if men have hobby to cook different items they can do it just once in a week or weekdays so that some burden on wife can be revealed. However, egos can make each other not to understand themselves.