Taylor Negron's Family -- Livid at Oscar Snub ... NPH's Junk Got More Air Time Than Him!

The Oscars focused more on Neil Patrick Harris' penis than a deceased actor who starred in iconic movies, and the actor's relatives are livid.

Taylor Negron -- who became famous for his roles in "Fast Times at Ridgemont High" and "The Last Boy Scout" -- was left out of the 'In Memoriam' tribute, which infuriated his brother Conrad Negron who said, "They'll have NPH come out in his underwear but not take a few seconds to honor my brother."

And Taylor's cousin Chuck Negron -- the lead singer of Three Dog Night -- says he was "floored" by the snub and demands some recognition from the Academy.

Conrad really went off, also saying, "They'll let Patricia Arquette go on and on forever but they won't give Taylor the 15 minutes he deserved." We're guessing he meant a few seconds.

Taylor died in January at 57 after a long battle with cancer.

Conrad says he and his family vow never to watch the Oscars again. After last night it's a safe bet ... they're not alone.