Jones began kneeling during the national anthem earlier this year and was recently criticized by spectators during a matchup with Nebraska.
The Terps dropped their fourth straight game and the Hawkeyes earned their third conference win.
The Terps couldn't match the Cornhuskers on the road, having difficulty with attacking errors throughout the match.
The Terps are looking to make the NCAA tournament for the first time since 2005 but face a difficult stretch of games, starting Friday against Nebraska.
The typically mild-mannered Hughes received a yellow card for protesting a contentious call in the third set, sparking the Terps despite the loss.
The Terps started to build momentum in the third set, but the Wolverines' efficient offense was able to best Maryland.
The Boilermakers closed the match on a 9-2 run to deny the Terps a chance at an upset.
After sweeping Rutgers for the second time, the Terps are confident going into games against No. 8 Purdue and Michigan.
The Terps showed off a more consistent offense in their second bout with the Scarlet Knights, delivering another sweep.
The Terps bounced back from their 3-0 loss to Penn State with a sweep of their own.