Lol - too true Alex. We're all familiar with terms like sub-drop. One of the terms that rarely gets heard is "Dom-zone" - but it's a real condition - basically - it operates this way - put two Doms in the same space and they will get on each others nerves - just by being in the same general space. As with light, the drop-off is exponential - so two Doms within 5 feet of each other will 'hackle' 4 times as much as 2 Doms no closer than 10 feet.
I know a fair number of Doms and Dommes real-time - and find I can count on the fingers of one hand the number of Doms I feel comfortable around...I tend to become competitive when there's another Dom too close (kind of like two cats staring each other down for primacy - lol).
I seem to have less trouble interacting with Dommes - I don't know if that's a general thing between Doms and Dommes or not - I've never bothered asking that question before. Perhaps its because most of the Dommes I know tend to be Tops under Doms or are entirely lesbian.
The 'hackle*' factor impedes communication real-time - it doesn't seem as much of an issue on-line to me - but I still don't feel overly chatty with another Dom unless mutual respect exists.
(Hackle n, v - the rising of the fur along the neck ridge of a dog when it's preparing to defend its turf - in some Doms it's more akin to the display of a peacock. Also the area of the body that responds by 'hackling'.)