reannasmom, this is very unusual. Usually children with food and texture issues also have sensory defensivenes, and hate to have sticky stuff on their hands and between their fingers. Getting them to play with finger paints and make mud pies is actually a therapy for them, to reduce this dislike of goop on their hands.
Do you know specifically what food and texture issues he has? Does he hate the shirt tag thing, have sock issues, hate having his hair washed, etc?
Do you or have you made a game of him doing this as perhaps he is doing this because it gets him attention,How about he had finger foods ,and stay with him while he eats ,say no when he goes to smear food and then remove it if he still does it and tell him why.