Hothead (1963)

Frank (John Delgar) is a hothead. He's very unpleasant, a terrible jerk. He's angry about his father having abandoned him and his mother, leaving her to work her way into an early grave. Frank had to go to work himself when he was twelve. Now he lived his aunt, his father's sister. 

Frank has the day free after he's fired from his job. He drives around in his big old car. He and his friends, Tom and Iris (Robert Glenn and Barnara Joyce) spend most of the movie dressed in swimwear. They pick up a pleasant, well-dressed middle-aged hobo (Steve Talbot) and take him to the beach. He calls the kids to hang around in a beach house he just broke into. They have liquor. With Tom passed out. the hobo tries to sexually assault Iris who runs drunkenly from the house and finds Frank who's sitting on the beach losing his mind. He thinks the hobo is his father.

Frank is completely unsympathetic. He probably didn't need to be. He could have been a nice guy who came to believe a hitchhiker was his father who deserved to die. 

The movie was the only credit for the director and most of the cast. One actor, Robert Pearson, appeared in 2001 a Space Odyssey as an actor in the inflight movie. Barbara Joyce was a regular on The Ken Berry Show and appeared in a TV series, Legends of the Superheroes (1979). Robert Glenn was in The Last Picture Show and Larry Buchanan's A Bullet for Pretty Boy.

It's free on Tubi and available on DVD.  Still available after all these years. That says something for it.