I've been to WDW multiple times with children ranging from infants to teens. I never knew, or noticed, that there was a protocol to autograph signing.
I am not out of touch with 2 year olds or their behavior, the youngest of my 4 just turned 3, so I'm pretty familiar.
According to the OP the mature 2 year old walked up to Mickey, handed him his autograph book, as he has done hundreds of times. He said very clearly and politely, "Please sign my autograph book." Within 10 seconds Mickey repeatedly refused to sign the book and then taunted the toddler by hiding his book, and reduced the poor wee mite to sobbing, and the child was removed from the situation by the irate parent. Within a time span of 10 seconds.
If my child was a sobbing crying disaster if he didn't get his way in 10 seconds it would be nap time. I'm pretty sure that if a 2 year old is reduced to "sobbing" in 10 seconds, the tantrum was in the works long before the evil mouse intervened.
My child's behavior wouldn't even register with me, I would chalk this up to tired or over-stimulated toddler. It certainly would never dawn on me to report this incident to guest services.
Now I will digress... what truly bothers me about this whole situation is the pettiness of it all. You are willing to jeopardize someone's job because your toddler didn't get what he wanted within 10 seconds. There are people who scrimp and save and sacrifice to give a once in a lifetime trip to WDW to their kids. There are people who travel with disabled and medically fragile children who are grateful that their children get a few hours in the park a day, during a once in a lifetime trip. The OP's children have been many, many times, and at the ripe old age of 2 are "experienced" WDW travelers, and they are complaining about a 10 second inconvenience their 2 year old had to endure.
Several months ago there was a young woman who posted, briefly, on the community board about being terminally ill and on hospice. Her thread was moved to the disabilities board, but it had a link to a trip report that she wrote. She was extremely medically fragile, and wrote, quite eloquently, about the obstacl
eses she faced just being able to visit WDW. It was very humbling, and served as an excellent reminder of all the little things most of us take for granted on a daily basis.
It should be mandatory reading on the Dis.