Just my two cents... if he wants to discuss a SFA, and you guys dont, just dont engage!
Quite simple... No one has to be silenced or put in time out just because you guys are tired of hearing it. Just stop talking to him about it. There are plenty of other people here who isn't discussing a SFA that you can engage with.
I don't think it's fair to try and control what someone wants to discuss, even you find it annoying.
HOWEVER, Steve you shouldn't be making personal attacks, insinuating that they are "stupid" or lack comprehension skills, etc.
We're all adults here ❤️