You really should stop to try and put yourself outside of it, you are not above any wrong behaviour ever.
As for manners, personally I am the exact same person here as I am irl...well, minus that here I'm actually chatty and irl I never speak of my own initiative ever, but if interviewed I'd speak in the same manner as I do here. I say what I think and actually believe that to do otherwise is a very counterproductive endeavour because it makes mutual understanding harder.