Parents do this with all the right intentions but end up doing more harm than good. I remember my own case where my son had an allergy for curds and anything that had a tangy sour taste. I tried to feed him but later consulted a dietician who advised me not to try and get him to like Yogurt since he has Lactose intolerance and it can become serious when parents force feed their children..So, it is better not to force feed but to look for reasons as to why the child is refusing a certain food ..
http://www.beingtheparent.com/negative-effects-of-forcing-your-kids-to-eat-1-3-years/