Toxic Masculinity.
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If it’s not obvious the person is struggling, then an offer to help with something as personal-spacey as loading groceries into a stranger’s car in a parking lot, is way more potential awkward trouble than it’s worth.
Also Silence of the Lambs would like a word.
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I'd ask anybody with a busted arm if they needed help, man or woman, but if they looked all pissed off and aggressive I might give it a pass.