The Mc is still an old man by default. He still doesn't consider himself to be a woman even if he's trap in the body. The elf is whom keeping him at bay in a sense.
I already know what his response will be.
He's overconfident because like his previous life, he has been in enough life or death situation, enough battles so this is nothing new.
His problem is that he's trying to treat the little girls body like his mature and masculine previous. Unlike his body, her's break easily so while it's a lot faster, him hitting as hard cause damage.
In other words, I believe he will stay himself but just not openly pick fights as much. Or that's what I get from this chapter.