I had similar experience with TMW. Tried to contribute with a new system in the game, made proposals and first draft implementation. I had 10 years of professional AAA gamedev at the time... I was mocked and kinda bullied.

Never looked back to this project, but explains why this project is basically stuck at the same place as before.

In any case, I didn't let this bad experience affect my passion for foss and I continued contributing to more welcoming and successful projects.