It does intend, but as it is only on update 4 for Season 1 of this game, to you really expect to get everything full throttle from the beginning? This game is not even at the halfwaypoint yet. I think a bit of patience is still warranted.
btw, there are several hints until now, not only the hint with doc and a weird eyes scene. Or did you just talk about the hints in Ep4?
For now, Charmane has only once treated him like "shit" and that in front of her cheerleader-buddys, to which she a bit later explained to him why. Just because you don't want to understand that, doesn't really equal to the MC not understanding it. Personally I don't like being talked down to like that and would certainly myself not be as forgiving. But the MC is like that. As we did not yet have another interaction with Charmane, that one time is not really enough to label her as treating the MC completely like shit. (You could always avoid both mother and daughter though, if you don't want to have anything intimately to do with both of them, but they are still part of the story.)
Then all is good. Was not really intended as too passive agressive, so if it sounded like that, I'm sorry. Though it really rubbed me the wrong way to read, you replayed and then said something like that. xD
You have to remember though, that the game is set in a slightly futuristic setting. (As evidenced by sharing the same world as RtP). So the non-specific "immunity booster" could be very well something like the update vaccination against the flu which is included in an medical checkup. Though that is just my point of view on that and why I see no issue there.