The world can be changed one relationship at a time.
"The most important one," answered Jesus, "is this: 'Hear, O Israel, the Lord our God, the Lord is one. Love the Lord your God with all your heart and with all your soul and with all your mind and with all your strength.' The second is this: 'Love your neighbor as yourself.' There is no commandment greater than these." - Mark 12:29-31
Personally, I'm sympathetic to the cleric's position. I do not like commercialized holidays. And I agree with the idea that unmarried people should be focused on getting married rather than engaging in romantic flirtations with people they're not married to.