I this forum? I dunno. It's hard to be approachable if everyone is very bitter and non-approachable.
Seriously doe, before i try to start a discussion (argument) I step back and look at what I'm dealing with. If the other guy (differing opinion or POV or whatever) is a conceded, cynical, condecending, retarded cunt I just don't bother. There is no point and it just ends up with both sides looking like assholes. If the conversation topic is heavily opinion based (Ex. Ylvis song, yay or nay [nay]) then I'd simply state my answer and reasons why, pushing matters is pointless no matter how awful their tastes are.
And there is some topics that should just be avoided completely (Ex. beastiality) because, again, It'll just be a shit flinging contest where the most monkeys with the biggest bowels wins.
I'm not very approachable most of the time either, I just find that being more understanding with peoples opinions helps a lot.
Other than that i'd say follow the forum rules.