Are short guys delusional?

My brother in law is 29 years old and has been single pretty much his whole life. He's short, like 5'6. Pretty good looking but the problem is that he thinks he's capable of attracting a high quality woman, and he only has like one close friend and zero social life. He says he's only really sexually attracted to women that are at least a little above average looking and slim.

Am I overthinking this? Or is his preference completely fine?
Are short guys delusional?
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