Sorry to hear about the brush off from the FA, but you know, you can thank your fellow F Class Travelers for leaving the aircraft in that mess. (baby or not)
Planes start off clean in the morning (yes, they could be cleaner...no argument there....and cleaner between quick turn-arounds...and cleaner blankets...) but someone left all that crap before you.
I don't know how many times I'll ask a F and/or C pax if they will would like their stuff thrown away (newspaper, cups, magazines, trash, etc) and they all say, "I'll take it with me". Upon landing, nearly 90% of those who said they will take their stuff with them, leave it behind.
That same stuff that was in the seat-back or on the floor, is now wedged between the seat and the sidewall. I can never figure out why people will say they will take the items with them, then leave behind the biggest pig-sty I've ever seen.
Do write to AA though about the condition of the plane, either way, it's not acceptable.