I think it was the “should” bit. Just as nobody should be able to tell you whether you can add light hearted features to your software that make you happy, you shouldn’t be telling others authors that it’s not ok for us to write open-source software that aims to be professional, transparent and trustworthy. I’m sure the things you write are these things too, and I agree sometimes it’s good to be light hearted and have fun, but I reject that we “should” inject reminders like this in our open source with the intention of reminding others it’s free. That would take us back to the days of nagware, IMO.
At any rate, if you were just venting, I hear you. Thank you for your contributions to open-source!