Richie Incognito -- HITS THE CLUBS ... Wells Report Won't Bring Me Down!!

Despite being demonized in the Wells Report, Richie Incognito hit the L.A. club scene last night -- to party like he didn't have a care in the world ... and TMZ Sports has the video.

Incognito hit up Warwick bar and lounge on Sunset Blvd. Saturday night -- sporting a big 'ol smile and a hat that read, "SWAG."

It was clear, incognito didn't want to talk about Jonathan Martin -- or the Wells Report -- or anything else related to the allegations that he bullied people on the Miami Dolphins ... but DID want to talk about Johnny Manziel.

In fact, Richie stopped and explained why he thinks Johnny's a "hell of a football player" and why he'll go in the first round in the NFL Draft.