folks have a hard time to accept, that the "picnic date" is a turning point for the MC & Jill relationship, whereas MC tending Sage when is she is having a flue , is not a turning point for Sage and MC, and it's still lead to the same rebound guy talk.
MC has different kind of Relationship with each girl. These girls not necessarily directly compete with each other, it's more of like, MC need to meet with different criteria for each girl. of course if MC play too much around, these criteria bound to clash with each other, most noticeable the Jill vs Sage choice. But its not really a direct confrontation between Jill and Sage. This not a good or bad choice, or who is right or who is wrong.
It just a criteria. In Jill case this is an important criteria, essentially you have to work toward for this end goal.
Sage does not have this criteria in episode 6, because MC's relationship with her is fundamentally different .
Bella and Jill, have the more "traditional " relationship approach, whereas Sage, and the Josy and Maya relationship is an unorthodox approach. therefore, what you have to do for them, is different.