Two years ago my then 4 year old neice Sara was with me at WDW. We saw Tough To Be a Bug and when the show was done she tried to stand up from her seat. The person before her apparently dropped their gum onto her seat and she didnt' see and sat in it. She couldn't lift herself off the seat, there was such a big wad and she was so small.
The CM saw me trying to pick it off her cheap, old shorts and told me to follow her and she would help me take care of it.
I followed her thinking she would get me some ice or tissues. She took me to a store and picked out the cutest Tinkerbell outfit, shorts and top and asked if Sara liked it. Of course Sara said yes, and the CM said then it's for you because we ruined your pretty red shorts. I tried to tell her no, Sara's shorts were old, but she insisted.
I can see why they would not like gum at the parks, it could cost them a pretty penny in replacement clothing. Peggie