Hi Jade, You are exactly right in what you are saying, I have noticed this also. I don't have BP, but someone close to me does and I have worked in the mental health field for many yrs with people with schizophrenia, bipolar, you name I have seen it.
Bipolar has been one of the most diagnosed mental disorders within the last 10 years. Statics say that one out of every four people will have a mental condition and at least 40% of those are diagnosed as bipolar. This is a lot of people. The type of people that make these comments are very obviously uneducated, and ignorant regarding what they are saying and other peoples feelings. All I can say is try not to take ownership for their bad behavior.