The famous "Suns In 4" guy is FINALLY opening up about his violent brawl with Nuggets fans ... claiming the whole thing went down because the Denver dudes poured beer on him.
Nick McKellar joined Barstool Sports' "The Dave Portnoy Show" this week and broke the whole fight down from start to finish ... explaining he was NEVER the aggressor in the situation.
McKellar claims he showed up to Ball Arena for Game 3 last Friday and made friends with nearly everybody around him right away.