It reduces people's motivation to become chefs (the people who are socially permitted to "play" with food). Society needs happy chefs. (Unhappy ones will spit in your food.)
Also, even if you find a way to play with your food safely, there is the meta concern: Think of others, who are less skilled than you (so they cannot play with their food safely), and who will now try to copy your behavior. There may even emerge a social pressure to copy your behavior, if playing with food becomes a socially accepted costly signal of high dexterity or something.
I am not sure I see or understand the issue that playing with your food is dangerous or anything. Maybe if you start catapulting it or juggling it, but sorting or stacking or making shapes doesn't seem dangerous to me.
I'm also not convinced that people will spit in my food if I play with it -
Hang on, if I write it down like that it just doesn't make any sense at all; First I receive my food and then I play with it, how are they gonna spit in it? Do they watch me and then spit in my desert? Or do they just start spitting in everyone's food (why?! It's not p...
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