> I wouldn't mind at all, but as things stand I can never get him to commit, and all the while while this goes on he attacks the arguer promoting that which he can't commit to, and that's very frustrating after five years if in fact you're genuine about that proposition and would like to argue it honestly.

Sounds to me like he's going for the "quick-win" approach to
philosophy, and when it doesn't work he switches tack or gives up and
goes off to bother someone else.

Just out of interest - which side of the debate are you on? Are you a
carnivore or an herbivore?