Wow, how Silly and petty has our culture became. Everyone is so sensitive these days, and I find it utterly stupid.
To have a female become offended when called a girl is utterly comical in my book. If it was done in a respectful manner, I cannot reason why this would bother someone. I have been on many "boys night out" or "hanging with the boys" on more than one occasion over the age of 18, and it's never bothered me once. Never. Take that and put it in your sensitive pipe and smoke it. (gee, I hope I didn't offend any sensitive people by saying that) A proper man or woman was taught and raised seeing and giving respect to others. That might be old school these days, so blame my mother for that.
If I call someone Sir or Ma'am, it's done out of being raised to properly respect another person. I additionally spent many years in the military, and that was how an officer was addressed. I sure didn't seem to find as many sensitive people in the military either. Respect was earned, and was given as well. As a senior NCO, I had to get in someone's rump on occasion, and if you were too sensitive to deal with it, then it was time for you to get out of the service. My job was to train you or keep you at a certain standard where during a war your sensitive rump might be saved due to my training I gave you.
In formal situations, a person will be addressed by either a sir or ma'am, based on my perceived gender. (If you are a female and look like a guy and I accidentally address you as such, suck it up buttercup and deal with it due to your diverse look, I meant no disrespect)
The women I know are addressed as gals or girls, and the men as guys or boys. I have yet to hear any one of my friends being so freaking overly sensitive that this would have bothered them. Of course if something so silly bothered them, they wouldn't be in my circle anyway.
Our culture is based on the women (men too) seemingly all craving to be 20 something, and every type of marketing out there is geared to this. People love to be guessed as younger as they are, so why a female would be offended by being called a girl is not only silly, but sort of a double standard. If they do complain, just reply " sorry, I thought a xx year old woman might appreciate being called a girl wouldn't bother you". Be sure to add an additional 10-15 years on their age, and see what kind of look you get. No doubt you will be corrected with their actual age, or maybe a little less. This of course reinforces my belief that both genders wish to look, feel, and act younger than they actually are. Of course there comes a time where they stop giving a rip, and I'd guess being called a girl or a boy wouldn't be that big of a deal to them either.
So in conclusion, I feel that if the proper respect is given when addressing the other person, I see absolutely no problem with it. If a person would take the time to tell me it bothered them, I would respect their wishes as well and not address them as such. While I would feel this is completely silly, I was taught respect of others.
If a person is so sensitive to this or other common titles, I'd say it's time to toughen up a bit.
I'm sure the politically correct police will stop by and let me know of all my shortcomings, but meh, I really don't care. It's my opinion. Deal with it.
Edited to say I didn't watch the video either, because I could tell it was full of politically correct feel good nonsense.