i stumbled across this post as my wife is awaiting all passengers to finish boarding and they denied her use of a carseat for our 2 year old in business class on 787. We were apparently lucky that we could use it on the 772 aircraft several weeks ago. The fight attendant was quite rude about it though. It's not what you say, it's how you say it. If you say it in a condescending, rude, and arrogant way, it will be taken as such. My wife is traveling with our 3 kids and they only fly business class and while not the most traveled people on earth, the kids have been Platinum Pro or Executive Platinum since birth.

Anyway, some FAs are rude... and to be rude to a passenger is not a requirement. To be rude to a passenger who is only leg 2 of a 3 leg journey, lasting 24+ hours with 3 kids (2, 6, and 8 years old) is not necessary. This was already after the fact the gate agent was incredibly rude and would not allow my wife to inquire with the crew about storing the umbrella stroller in a closet. We have stored this stroller in closets on 773, and 772 on AA and 787, and 777 aircraft with UA. It fits in an overhead bin along with the 3 kids carry-on and tucks nicely in the back of nearly any closet onboard (without disturbing hanging clothes and the occasional crew bag stored in the back of the closet.

I find it completely unnecessary in a customer facing role to be rude. Yes, the job can be frustrating at times but kindness goes far. Being a ..... just makes your customer want to look elsewhere next time they spend 7k per person to fly in a metal tube.