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Radio waves diffract strongly around big...

Radio waves diffract strongly around big buildings but light waves do not. Why?

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The wavelength range of visible light is from `4xx 10^(-7) m "to" 7 xx 10^(-7)`m, while that of radio waves is from 0.1 m to `10^(3)`m i.e., the wavelength of radio waves is much greater than that of light waves. We know that bending of waves increases with the increase of its wavelength. So radio waves are easily diffracted while the wavelength of light waves is too small to be diffracted around big buildings.
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