Do men only brag about being "manly" when it's convenient for them?

I don't consider myself a "man" as I'm only 24 but look 18

Many men like to get "manly" with me on stupid shit like "masculinity" or "assertiveness" but since I'm much leaner & athletic... these same "men" ignore anything athletic against me

I'm just assuming they don't want to challenge me where I shine? Playing to my strengths kind of situation?

Do men only brag about being "manly" when it's convenient for them?
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