Not so much bi bashing here. I rather see a lot of people defending bi . As a bisuexal myself, I usually prefer to ignore judgemental people, because I'm tired to explain everything all over again.
However, to make things clear, whether I'm with a guy or a girl, I'm exclusive (meaning it wouldn't cross my mind to fool around with someone else, I'm NOT polyamorous), when the time comes to choose, I choose girls because my relationships with girls always have been more meaningful and exciting. And I value long term relationships over short-term ones. I've been with my current partner for two years and as long as it works, I don't plan on dumping her (fingers crossed).
So yeah, everyone is different. I don't define it as "sexuality", but as "love life", because if I have no romantic interest or emotional connection with the person, then there's no relationship, or sex, possible from my point of view.