How much you know about Manu? Who was Manu & what he said? I don't think you have ever read the Hindu scriptures, that's why u are taking like this. You are talking on the line of Mayawati who said that kill the Brahmins but now she has very much faith on Brahmins.
Manu has not created the caste system, it is we people created that and blame Manu. During that period Manu said 4 division Bhahman (who knows Veda, who teach the scriptures), Kshatriya (who fight for the country, protect cow, woman, praja), Vaisaya (who do the business) & Sudra (who just busy in sense gratification). And this division was decided on the birth but by the work you do. And in this Kaliyuga we all are sudras only, no brahmin, kshatriya. B'z now a days we do not know Veda, we are not able to protect our country, cow, women etc..., we all just do our sense gratification & start eating meat so we all comes under sudras only.
There are plenty of example where there is no difference between low & hight caste. For example, ISKCON there are big-big swamis who belongs to low caste. ISKCON they say that if you are Vaishnav then you are above the so called Brahmin also.
If we start reading the scriptures (Bhagvad gita, Ramayan, Manusmriti, bhagwatam) then we will understand the true Hinduism.