M.P.
Perhaps he senses your concern about eating. This will cause him to be anxious. I suggest you just continue to offer him choices and eventually he'll learn to eat. Stick with 2-3 choices until he gets used to them.
Have you tried putting food in front of him and then not pay attention to him? Go on with your own meal, or do something else.
When did he have the g tube removed? If it's been recently he's still learning how to eat.