I have to say I completely dislike Bluetooth in all of tis incarnations for one, and only one, reason: Fat women with big hair making phone calls in Wal-Mart.
Almost every time I go to Wal-Mart, I will have at least one encounter with at least one monstrously huge woman with big hair who makes a call on her Bluetooth headset while standing next to me. It always starts with the woman standing next to me and saying something that does not indicate she's on the phone.
"Hi." Or maybe, "How are you?"
I reply in like. As greetings are very generic, it seems very likely that I give the same or similar greeting as the person she's talking to did. That throws me off even more, because she acts like she paid attention to my response and says something like, "So, what have you been up to," or, "I'm glad to hear you're doing well." Then the conversation gets weird and disjointed as i try to keep up with her increasingly esoteric conversation. After an interval anywhere between 30 seconds and my personal record of just under 3 minutes, she looks up, asks me what the hell I think I'm doing or who am I talking to, and I realize what happened and tell the fat-woman-with-big-hair-and-a-Bluetooth-headset of the day that I'll be over in Gardening dieing of embarrassment if she needs me.
So, I hate Bluetooth.