@roger,
I was a child, long long ago, who hated food that wiggled, so I have some sympathy here. I think I was forced to try some foods at other people's houses.
I originally hated spaghetti, which, if you know me now is funny. I also hated pudding, tapioca, well, the list is long.
Re Roger's comment about grease, that could make sense. I figured myself out, some time ago, as then being addicted to salty grease with a followup of sugar/fat, which made me then want some nice salty grease. Took me a while to walk away. I still like a treat once in a while, but I'm not caught up in the grease/salt/sugar whirl as a daily thing. You are talking about a child, though, so I've no idea, maybe the child just hates mushy.