In general I want to promote the standards defined by the Contributor Covenant Code of Conduct, but I am a single person, this is not a big (or small) organization, and I have no experience dealing with these situations, I prefer keep it simple for now, but when in doubt, please take the Contributor Covenant Code of Conduct as reference.
I basically ask contributors to play nice, be respectful and mindful with other contributors and users and don't discriminate on any ground.
Please do contact me (luca-conduct@llucax.com) if you feel offended by the actions or saying of any contributors (including myself, which could be a tricky thing to do, but I'll do my best to be introspective and acknowledge and correct my own behaviour). I'll do my best to take corrective actions.