The proper response by a mentally ill person to the phrase "well it can't be THAAAT bad" is calmly smiling and stabbing yourself in the hand with the nearest object. While never wavering on the smile.
Wait... no that's not it. Oh, yes. The correct answer is ignore the pain from the thoughtless statement and swallow your emotions. No. Not it. but closer. Ignore and vent to someone who loves you? Yeah, that sounds about right.
Lots of hugs for you, your BF and BF's Sister. Here's a wish that her good days be awesome, and her bad days be sleepy.
@girlysprite: You just hit the nail on the head. When I get up, wash, comb my hair and do my makeup nicely, obviously that means I'm "cured" and don't need love of understanding anymore right? Apparently yes, ecause my father believes this implicitly. Hence why the "smile and stab hard" method becomes tempting. If I'm not gonna get support anyway, why restrain the urges, right? I wish people would realise that a nicely groomed Bipolar is simply one who is trying harder right this moment, not one who is cured. And that it can still be a really bad day, even if the eyeliner is flawless.
You sound like you speak from experience. I'll go ahead and send lots of good wishes to be used on yourself or anyone else who needs some.