Deen is complete. Deen is easy. Deen is for all times. What Nabi (S.A.W) told us to do forms part of Deen. What Sahabah (R.A) did also forms part of Deen . To do an action not proven is generally classified a ritual and custom. If this ritual and or custom is done with a notion that it is part of Deen or is earning reward or gaining proximity to Allaah - then it turns into a Bidat. At times the exchanging of sweet meats becomes a forced social obligation rather than a token of happiness. So it may be done some time and left other times, with no obligation or "if I don't give them my nose will get cut".