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Maybe try a more formal debate setting? I know there are some places like “the crucible” that facilitate that.
I doubt you will find anything on Lemmy unless you start up a highly moderated community. Even then, people can bring questions against the moderators.
Discussion and debate are pretty lawless in nature.
This! You can never “win” or get the last word, but you can get the other person to show how bad their arguments are. You just have to trust that others will decide on what is right correctly.