Do college professors usually favor the nerdy, "plainer" looking students?

from what I've noticed, college professors seem to get along better and treat the nerdier or the "plain" looking students moreso than attractive students, contrary to what your reason might say...

do you think professors are biased against attractive students assuming that they are stupid or dishonest and not to display favoritism based on appearances?
Do college professors usually favor the nerdy, "plainer" looking students?
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