full of hypocrites

Reading the various posts on reddit, there is an interesting bias that gives you the impression that this forum is full of hypocrites. I wanted to know if this bias has a name by the way

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Example:

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A woman asks if men generally like tall women.

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-> the men who like tall women come forward and answer and the others don't, remaining silent, suggesting that most guys do.

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Example 2:

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A man asks if women like shy men

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-> the very few women who like shy men speak up and the rest don't, suggesting that most women do.