Naftush/Sam2/oomis:
Yes, there is indeed a full sugya about what does and does not constitute sheilas shalom. I am not denying that, nor am I suggesting that those who wish members of the opposite gender a “Good Shabbos” have no poskim to rely on; far from it. I was merely responding to Naftush’s comment that called the concept of forbidding interactions between the genders an “outrage”, and demanded a mekor for it in halacha. I was simply pointing out that this idea does indeed have a mekor in the Shulchan Oruch, and as such should not be bashed and branded an outrage so quickly.