If you did get all the dishes delivered, and you only ate a bit of each, aside from what the FAs think, it's quite immature and inconsiderate.
Not that I would do it, but if you wanted to sample one of each dish, and provided that there was enough loaded so all pax in the cabin got their first choice, I don't see why the crew would baulk. The food has to be incinerated on landing anyway so it's not as if it will be wasted. At most you deprive the crew of having whatever isn't ordered and is left over.