"It was one of those things, I was out of the dugout as the play was developing," Quade said. "I told you guys, I don't manufacture stuff, I was mad. To me, I thought he was way off the bag."
Quade, who was ejected by second-base umpire Paul Emmel, appeared to have a valid argument as replays showed that Beckham never came close to touching the bag after fielding the throw from Brent Morel at third.
"There have been times when I was wrong about plays, and I was once earlier in the year in Los Angeles and I admitted it," Quade said. "But I was pretty sure I was right (this time). Of what I saw, and when I did see a replay, it didn't change my mind."
It was the third time this season that Quade has been ejected.
Sahadev Sharma is a regular contributor to ESPNChicago.com. Bruce Levine contributed to this report.