Another one who says "the rules are very clear" but I challenge you to point out where in the rulebook does it say that this is grounds for immediate disqualification
Sure thing.
PHYSICAL ABUSE
Players shall not at any time physically abuse any official, opponent, spectator or other person within the precincts of the tournament site. Violation of this Section shall subject a player to a fine up to $20,000 for each violation. In addition, if such violation occurs during a match (including the warmup), the player shall be penalised in accordance with the Point Penalty Schedule hereinafter set forth.
S. POINT PENALTY SCHEDULE
The Point Penalty Schedule to be used for violations set forth above is as follows: FIRST offence WARNING SECOND offence POINT PENALTY THIRD AND EACH SUBSEQUENT offence GAME PENALTY 47 However, after the third Code Violation, the Referee in consultation with the Grand Slam Chief of Supervisors shall determine whether each subsequent offence shall constitute a default.
T. DEFAULTS
The Referee in consultation with the Grand Slam Chief of Supervisors may declare a default for either
a single violation of this Code or pursuant to the Point Penalty Schedule set out above.