Aaron Hernandez -- Kicked Out of Bar After Pounding Tequila

Aaron Hernandez downed a ton of hard liquor, cussed out security guards ... and refused to leave when they confronted him ... in a Hermosa Beach, CA sports bar.

According to sources who were in Chelsea Pub & Lounge on April 19th ... the then New England Patriots star was drinking double Patron Silver shots all night in between glasses of Adios Motherf**kers -- a wonderful vodka, rum, tequila, and gin concoction.

We're told Hernandez repeatedly tried to walk outside the bar WITH his drink, and didn't understand why security wouldn't let him -- and began yelling and cursing at the bar staff.

When asked to leave ... Hernandez simply sat down (pictured above) and told security he wasn't leaving.