Island Boys' Flyysoulja clashed with reality star Antonio "Tony" Castellanos in Florida Thursday night ... leading to a violent confrontation caught on video.

Check out the clip ... which opens with Tony following Flyy while the two are beefing ... Tony catches up to Flyy and shoves him with force. Clearly, Tony is pissed -- cursing at the streaming star as his pals tell him to knock it off.

Tony tells TMZ it all went down near Moxies in Miami after he approached Flyy -- one half of the Island Boys duo, with his brother Kodiyakredd . Tony -- who has appeared in "Battle Camp" and "The Mole" on Netflix -- says he loudly called Flyy and others "NPCs" -- Non-Player Characters, a Gen Z insult referring to someone as "bot."

Flyy got offended and started yelling back, according to To

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