I wasn't angry with him, or even annoyed. I simply learned long ago that people who don't have skin in the game rarely give good game advice. People pitch me all the time what programs I should write.
I've written many products over the years, some were successes, others were failures. A common thread has emerged: all the failures were pitched by others. All the successes were ones I wrote to please myself, and everyone told me I was a unique snowflake and nobody else would want it and I would fail.