I understand your discouragement, but I don't think you have to take it personally. It's possible your song would have been well received in a different sort of venue.

I don't know what sort of "club" you sang at, but know that at Irish sessions where people are exclusively into playing "chunes" it can impossible to get people interested in a song. I wonder if that's why so many Irish songs are done a capella - because you really have to get away from instruments to sing them. Maybe singing and playing instruments are really separate traditions.

I once was a member of an informal group that met once a month for the express purpose of singing songs. There were no instruments there at all. The group was organized by the wife of a famous Irish musician. She was tired of being shut out of the sessions her husband played at.

Not all of the songs we sang were Irish. A lot of them were English or American. We especially liked songs with choruses that the group could pick up quickly, and many of us would harmonize, or try to. Sea chanteys worked especially well for this purpose. But even when someone sang a song that was strictly solo, the group was politely attentive.

Alas, the group is defunct now, and even the bar where we met has gone out of business.