With this sort of thing in life I tend to just take the dive.

I mean, the reason people stereotype bipolar disorder in the first place is because the people who do so are simple-minded, highly suggestible lemming types. Their critical thought capability tends to amount to little more than a game of Follow The Leader.

Which actually can give you an advantage in dealing with them, because their number one priority most of the time is to fit in and gain approval, to follow the leader. So if you take on the role of leader and clearly display an attitude that it's a part of life, isn't rare or freakish, doesn't change who you are, and is just something you have to manage the same way diabetics have to manage their insulin, the same people who would be like, "Oh, my, gosh, Becky, look at her mania, it is SO big," are going to be the people, typically, who will follow your lead and mimic back to you that it's not a huge deal, or any of their damned business. Whichever route you wanna take.