Differences in Defending Yourself and Defending others (Psychology)

"I will defend others to the death, but for my self I might let bullying happen or be treated badly". (so for others defend but not defend self half as much)

A lady told me this, that for others she'd defend or go the extra 10miles (even unnecessarily) but not stand up for herself / take being spoken to badly.

For me this taps into a regularity I see with people (combination of low self-esteem / high insecurity but for others wanting to please / be looked well upon so works differently in different situations)

Something about human nature in that; pleasing others but then not knowing how to command one's own ship / being afraid of standing up and potentially being in a fight about one's self-respect (which a female may feel the lesser for many physical and psychological reasons)...

Females mostly (or males inversely can think they can do things but it's false self-esteem / overkill).

Also in terms of attack and defence people are often quick to defend others (correctly and incorrectly) but for themself might go into self-doubt or depression, worry etc. This more person combat I think creates adrenalin and nervousness whereas externalising it or repenting others moral is comparably easy.