Our unpleasant experience happened in the airport before we left for WDW.
This was a few years ago. Our daughter was 13 months and we had purchased a seat for her and had her car seat with us for the flight.
SW still had the preboard for families at that time so we were in line to board. They made an announcement that the flight would be full.
This woman in front of us starts complaining loudly that she "Hoped they didn't think they were putting that car seat on a full airplane!!"
My husband and I just looked at each other with raised eyebrows.
We were walking down the ramp behind her and she was still ranting saying "Who do they think they are? The plane is full!!"
I was giggling to my husband that it would have been pretty funny if we were gate checking the car seat and she was complaining for nothing. (which she really was, she just didn't know it)
When we walked onto the plane I saw that the left side bulkhead seats were open so, I took the row with my daughter, her seat and my middle son. My husband and oldest son sat behind us.
When I started to buckle the car seat in I heard her again. I looked over and she was across the row in the other bulkhead seats.
She looked at me and said "I know you aren't going to put that car seat in that seat".
I replied "Yes Ma'am, I am. We bought a seat for our daughter". With the nicest smile I could muster.
She didn't understand me so she said "The plane is full, you can't put that car seat there!!". She was starting to raise her voice at that time.
I replied again, "Ma'am, we paid for a seat on this plane for our daughter, we can use her car seat and we are".
She looked at me and told me she was going to speak to a flight attendant. I told her to go ahead.
The flight attendant came over and asked "What seemed to be the problem?" I told her I did not have a problem at all except for the fact that this woman had been harassing me since Preboard. I then explained what the deal was. (The flight attendant was being very nice through this). She winked at me and went over to the woman and explained once again that we had purchased a seat and we were free to do whatever we wanted with it.
The woman STILL did not understand. The Attendant fnally walked away and I strapped my daughter in.
That woman made comments on and off the entire flight!!
When we went to walk off the plane I looked at her and just said "I am sorry you do not understand that we did nothing wrong but, I hope you have a nice day" and walked away.
I could hear her complaining to her poor husband while we were walking away about "The nerve of that woman".
I was so proud of myself that I didn't flip on that pain of a woman!! She was really obnoxious and not just before the flight, the entire flight!!
We have had our daughter in a car seat every flight since and have never had a problem.