In the present day situation it is permissible to keep friendly relations with non-Muslims including Hindus, and if the occasion arises where one must eat with them then if the food is halal (permissible) then there is nothing wrong with eating there.
[Note: This fatwa address a concen that eatting food cooked by Hindus could fall into the forbidden catagory of Islamic jurispudence, according to the prohibition on eatting food prepared by a mushrik (a person who denies the unity of God).]