My friend, the dance floor is sacred ground.
If you're not dancing, keep off it.
The floor is for the dancers. They're moving united with the music, the leaders taking extreme care with their precious followers. Followers do not want their trance interrupted, leaders don't want to take evasive action.
So if you're that idiot striding across the floor to the drinks, stop it. If you're the prat walking into dancers as you try to get to your bag, get a clue dude. You do not take precedence. The floor does. And if you must walk along the edge, do it in a way that doesn't mean dancers have to adjust their dance in any way, however tiny.
And if this doesn't make sense to you, then you don't get essence of tango in milongas. Back to school, fool.