Antoine Dodson -- WORST. PUNCH. EVER. ... Attacks Man At Boxing Event

Here it is ... Antoine Dodson throwing a PUNCH at another man ... and it's hilarious.

A-Dod -- who became world famous for fighting off a bedroom intruder back in 2010 -- will be a pugilist in a "celebrity" boxing event in November ... taking on a man he claims is the actual 2010 perp.

During a media event for the fight this week, the "Intruder" confronted Dodson -- who became "upset" and tried to slug his foe with a right ... uh ... jab?

Again, it's hilarious.

A mini-melee breaks out ... with Antoine flailing around and screaming at the other man -- "It is what it is, n**ga!!!"