My story is not nearly as ugly as OP's. That would crush me if I gave advice to someone taking a child and they were so spiteful about it all to actually deprive their child of an experience that the child would so obviously love.
I gave Disney advice to a friend several years ago- it was a nightmare...even to this day it comes back to haunt me now and then. They are very frugal and couldn't secure their travel dates until last minute, so nothing was booked in advance. Until recently, they refused to spend more than $50 a nt on any kind of lodging- so you can imagine that my list of benefits of booking early, waiting for a discount to come up, and staying at a value resort fell on deaf ears. She argued that the $37 a nt motel they were staying at had a continental breakfast and free transportation- but the free transportation stranded them in the parks (cab fees and eventually parking fees) and the breakfast was so bad they had to buy it each day. I know there are good offsite hotels- but this wasn't one of them. Actually reminded me a bit of when the Radisson stranded us at Epcot for nearly 3hrs, but that's a different story...back to the crazy friend... They are not very active people and didn't take my warning about all the walking they'd do...so the physical strain was pretty bad. Just like the hotel frugality- they didn't believe in anything beyond fast food until recently. They didn't listen to the warnings about the cost of food- so they barely ate....wouldn't even dream of trying TS meal. They called me each day and sounded truly excited when they got to each park- but once inside- they could never get past the "it's just another amusement park" mentality. They still feel this way to this day and don't see any need to return. Last year I asked if they ever got to see any characters- since I hadn't seen any character pics in their albums. Not only did they not see any characters, they didn't try to see them and didn't want to see them. My friend said she personally thought they were stupid and would probably have kicked Mickey if he even dared approach her. To this day she tells people about all of the attractions I recommended that her family hated. Sure- I didn't know Imagination had been masacred, but beyond Soarin' and Fantasmic- they pretty much found no magic.
When people gush about my family going over the holidays- she always chimes in and says they went once during the holidays and it was just alright.
So, I've vowed to only arm people with info from books and web sites. I have another friend currently thinking about planning a trip...and that's all she's getting. Besides- she's one of those people who would say a moderate is too expensive - and then turn around and book 2 weeks at GF without batting an eyelash. Nothing wrong with staying at the GF- just don't play like something's too expensive and then far exceed the balked at expense. Yup- so just recommending web sites and books for her.