MGTOW believes that female validation isn't important. But we humans are animals and animals need validation from each other.
(Keep in mind I'm speaking of healthy validation. To have healthy validation from other humans feels great. At an early age this also helps build confidence.)
(Kind of off topic but still interesting. Most guys that call themselves incels grow up with zero validation. They don't hate women, they hate themselves and project it. Society only can see the hate projection so people give incels even more negativity which keeps incels in a cycle of self hatred)
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Basically what I'm getting at is we humans need each other. It's a very basic primal instinct to want to be needed and/or acknowledged in a positive way. We love to bullshit by saying "we don't need women" or "we don't need men".