How about we cut Tilt some slack? Maybe it's a bad day. Maybe he got hooked on a subject - happens to me all the time, so maybe it happens to him. I'm glad he has been able to contain it as much as he has. I remember some discussions over a year ago where everyone was slashing each other. This discussion has not gone there.
Discussion about the style of discussion isn't meta-discussion until it goes bad. The style can certainly distract from points under consideration. But sometimes that is the issue of the moment, that the style has left the track, so to speak, and advancement of discussin of the points is getting difficult. If it is to advance discussion of the points, it is issue. If it is to distract from the points, it can be meta-discussion, ill-will, false argument, etc.
At that point it up to the players to surface the style issues and their impact. Looks like that has happened. Hopefully they can get it back on track.
I'd like to see what more is said on Ian's thread. Discussion style issues have been aired, players may or may not modify their style, etc. The issues appear to be legitimate ones, not falsehoods designed to derail the discussions.