Abu Hurairah (May Allah be pleased with him) reported: The Messenger of Allah ﷺ said, "When any of you is invited to a meal, he should accept the invitation. If he is observing Saum (fasting), he should supplicate for the betterment of the host and if he is not fasting, he should eat". Muslim.
Avoid : Refusing an invitation or not showing gratitude towards hosts.
Lessons : We should always show respect and appreciation towards those who invite us into their homes and share their meals with us even if we cannot physically partake in them due to fasting or other reasons.