How about a marking method to mark players that habitually disconnect when playing against them
This marking method will take the form of a red/ yellow or green highlighting to indicate which players tend to disconnect after a bad shot - this invariably happens across the board although more so on higher skilled players than others.
The marking method would be for one's own benefit (so that you don't have to keep a little black book of bad form players (although it could be put to a vote if the marking method should be adopted to be visible by all players) nevertheless it will have no bearing on that players rating - just a method of highlighting undesirables.