If somebody forgets to add salt in the dish, we can tell them they have forgotten adding salt. If we don't do it, when they taste it, they will understand and feel that the guest is not happy with the food. As a guest, we should know our limitations and comment based on the situation and the facts. But some guests talk rudely and the hosts may feel bad. That type of behaviour should not be exhibited by guests at any time.
Hence the feed backs lack consistency in responses and so the host should not take seriously for such adverse comments. Participants in such functions should display their maturity so that the host is not unduly disturbed with unfavourable comments.