Flea Goes Nuclear On 'Suck Ass' Boston Celtics, 'Satanic Bottom' of NBA

[[tmz:video id="1_d179zza9"]] Flea HATES the Boston Celtics with the red, hot, fiery passion of 1,000 suns -- and when we saw the Red Hot Chili Peppers star at LAX ... HE WENT NUCLEAR on Beantown!!! Oh, we should mention he's a die-hard Lakers fan ... if…