They are not. I have many Asian friends and have family who live in Asia who I visit every year.
I find them to be the most polite, friendly and sociable people I have ever met and I have been all over the world.
I would say the most disgusting people I have come across on my travels are white Americans, closely followed by white UK Cockneys (London).
Asia is a big place so to call a whole continent disgusting shows you have never been there so have no basis for your statement.
I have been to China, Hong Kong, Philippines, Thailand, India, Pakistan, Sri Lanka and Japan and found the people to be the most welcoming anywhere in the world.