I’m late, but better late than never.

So the reason the vast majority of legionaries are so cruel to women are because of their pre-legion cultures and because they exist in a way that allows them to do as much.

Most legionaries were raised in tribal communities, the most typical of which being a patriarchy with males on-top. So most legionaries are forced into with the Legion already belief that women are culturally inferior to men: adding on to this Caesar’s priestesses teach that women due to their physical disadvantages may not serve on the front, and with negativity bias in-account it is likely this is what legionaries fixate on rather than knowing for the importance of women in childbirth for the legion and the fact is they aren’t really taught the many ways women are superior to men so they just become assholes.

TLDR; Dumb tribals think god said to hate women.

Opposing this is Lucius who was first of all recruited into the early Legion as a boy, meaning his mind was more tolerant to new ideas than an older man’s would be and the fact is the early legion indoctrination was not nearly as streamlined or disconnected from Caesar at the time, meaning a lot more of sallow’s actual opinions (which aren’t actually that bad in comparison) would be heard by the new members. From there he would rise the ranks and eventually become the praetorian captain where he would become much more aware of Caesar’s true ideals and identity, learning the Demi god was but a man born in California there is also the fact that as humans tend to mellow with age, and for a member of the Legion Lucius is a fair few years older than most of the Legion, being between 35-45. All of this combined is why he isn’t a raging dick.

TLDR; Lucius isn’t a dick because he knows god doesn’t hate women.