Height is preference but weight is not?

I'm 170 cm tall. Most girls don't like to date guys who are short guys or shorter than them which is normal and I agree that it is a preference but when a guy don't want to date a heavy girls or heavier than them but then people don't see it as a preference but a discrimination which I don't get cuz weight and height is a appearance so both should be a preference and another thing is that MOST people can control their weight but their height so there is no good reason to not count weight as a preference cuz then it doesn'tmake sense.
Height is preference but weight is not?
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