The Hollywood veteran looked put off by the “Deadpool” actor making light of the matter, which revolves around his wife, Blake Lively, accusing her “It Ends with Us” co-star of sexual harassment, fostering a toxic work environment, and launching a smear campaign against her.

The legal feud between Blake Lively and Justin Baldoni has been scheduled to go to trial amid both parties’ continued media back-and-forth over their issues.

Following Sunday’s “SNL” 50th Anniversary Special, Kevin Costner’s reaction to the ongoing legal feud between Ryan Reynolds’ wife, Blake Lively, and her “It Ends with Us” co-star, Justin Baldoni, has gone viral.

It all started when Reynolds, who attended with Lively, was called out by Tina Fey and Amy Poehler after being spotted in the audience.

He was then jokingly asked, “How’s it going?” to which he replied, “Great! Why, what have you heard?” seemingly referencing the bitter legal feud his wife is currently embroiled in with Baldoni.

However, while many in the audience laughed off the remark, Oscar winner Kevin Costner, who was seated behind Reynolds, didn’t seem to find it amusing, as he reacted with a visible grimace.

Several social media users commented on Costner’s priceless reaction to Reynolds’ apparent joke about Baldoni and Lively’s legal feud.

“The rest of us are Kevin Costner. Blake and Ryan have some explaining to do. Also, what they did to Justin Baldoni is not funny at all,” an X netizen reacted.

“Forget Ryan Reynolds and Blake Lively. Look at Kevin Costner’s face. LOL,” a second user wrote.

Another individual commented, “Kevin Costner’s reaction to Ryan Reynold on SNL50 is classic. Blake Lively and Justin Baldoni’s fiasco has spread throughout Hollywood.”

A fourth person penned, “Ryan Reynolds and Blake lively is so cringe. Kevin Costner’s face tells it all.”

One more X user commented, “So proud of Kevin Costner for standing up to narcissistic bullies like Ryan & Blake. Kevin has been starring/directing/producing his own movies since he was in his 30s. He was ridiculed by the WHOLE INDUSTRY for making Dances with Wolves. If there’s anyone who knew the hardship that Justin had to go through to make his movies—it’s Kevin.”

Last year, Lively filed a legal suit against Baldoni after their work relationship broke down while filming “It Ends with Us.”

In her suit, she accused her co-star of sexual harassment and fostering a toxic work environment.

Lively also claimed that he orchestrated a smear campaign against her to ruin her reputation.

As part of her strategy to prove her claims, the actress recently had subpoenas sent out to cell carriers Cloudflare and AOL, as well as from Jed Wallace, a crisis consultant who was linked with launching a digital army against the actress on Baldoni’s behest.

Via the subpoenas, Lively hopes to obtain receipts, including phone records that are relevant to the case.

In response to Lively’s accusations, Baldoni furiously denied them all and filed a $400 million defamation suit against the actress.

He also released his own version of what went wrong to defend himself from Lively’s claims.

Recently, he amended his suit to include more claims due “to the overwhelming amount of new proof that has come to light,” per the Daily Mail.

According to his lawyer, Bryan Freedman, “this fresh evidence corroborates that due to purely egotistical reasons,” Lively and her team “colluded to destroy reputations through a complex web of lies, false accusations and the manipulation of illicitly received communications.”

As Baldoni continues legal battles with Lively, his career and financial stability face major setbacks, with the actor already losing three projects and hundreds of millions in earnings.

In a recent interview with Fox NewsDigital, reputation expert Ryan McCormick predicted lasting damage, telling the publication, “Justin Baldoni’s career is going to nosedive because of this legal battle. It’s not because of his acting ability or following.”

He explained: “Even if all accusations are proven false, I think in the eyes of studios, he’s radioactive. Entertainment companies take a risk on each film, not knowing if it will connect with the masses. With Baldoni, there’s now added perils of not knowing if another legal battle will manifest with his future co-stars.”

McCormick also noted that Baldoni “has run awry with one of Hollywood’s most powerful couples.”

He explained that their “sphere of influence goes far beyond what the public sees. I can see Blake Lively and Ryan Reynolds subtly letting film studios know that they will not do business with them if they do business with Baldoni.”