Matthew McConaughey has never been one to blend into the crowd, and his courtside presence at the U.S. Open semifinals on Friday proved exactly why. The Oscar-winning actor, known for his laid-back Texas charm and larger-than-life persona, turned heads in Flushing Meadows as he cheered, grimaced, and gestured through every point alongside his longtime friend and fellow actor Woody Harrelson.

But while some fans appreciated the star power, others were less impressed. Video clips of McConaughey's reactions quickly went viral on social media, sparking a heated debate: Is the man simply an enthusiastic tennis fan, or is he performing for the cameras?

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Critics didn't hold back. "His whole life is a performance. He's good at it," one fan wrote on X, formerly known as Twitter. Another chimed in, "This is painful and cringe to watch. Just be a person, man." A third added, "This is not aura. Do not act like this. This is performative and weird."

Yet McConaughey also has his defenders. One fan countered, "He's the type of person you can't take your eyes off. We've all worked with, or been in social gatherings with someone like this, and they draw people in. They have this natural effortless presence that's impossible to describe."

This isn't the first time a celebrity's sideline behavior has caused a stir. Just weeks ago, US Open fans themselves faced backlash for what some called embarrassing conduct during matches, showing that the line between passionate and over-the-top is often in the eye of the beholder.

McConaughey and Harrelson, who famously starred together in HBO's "True Detective" and are set to appear in the upcoming Apple TV series "Brothers," seemed to enjoy every moment of the high-stakes semifinal. Whether it was a double-fault or a blistering winner, McConaughey's reactions were impossible to ignore.

The tournament itself concluded on Sunday with top seed Alexander Zverev defeating No. 8 seed Ben Shelton, who had hoped to become the first American man to win a Grand Slam since Andy Roddick triumphed in Queens back in 2003. McConaughey, a devoted Texas Longhorns fan, will now shift his attention to college football, where the Longhorns are off to a 2-0 start after a big win over Ohio State.

Love him or hate him, McConaughey knows how to command attention. His US Open appearance has once again proven that when he's in the room—or in this case, the stadium—all eyes are on him. Whether that's genuine enthusiasm or calculated performance, it's clear the actor knows how to play the crowd.

For those who find his antics hard to watch, it's worth remembering that McConaughey has built a career on being unapologetically himself. And for a sport that often thrives on tradition and decorum, a little Hollywood flair might just be what the US Open needed.