Its ironic that manual workers are the people who actually create the wealth which the people who look down upon them (lawyers, bankers, investors) work with and get paid with. For this reason I respect manual workers a great deal as they do much harder jobs than other qualification based occupations, and usually get paid a shockingly unfair wage for doing it.
Anyway, I could hardly say I look down upon manual workers as I have done my fair share of manual based jobs in my years.