Fans shred comedian John Mulaney for being a 'transphobe.' Why? Because Dave Chappelle opened for him.

Fans say that comedian and former "Saturday Night Live" writer John Mulaney is transphobic — all because comedian Dave Chappelle opened for him ahead of a recent set.

What are the details?

Mulaney is apparently being branded transphobic by association after Chappelle — who has been accused of transphobia for joking about the transgender community — opened for the comedian ahead of a Friday show in Columbus, Ohio.

Fans who attended the show took their grievances to social media, where they castigated Mulaney for allowing Chappelle to associate with the show.

One user, @boobeoisie, went viral for remarks about the show.

The user wrote, "Tell me why I just went to the John Mulaney show and Dave Chappelle was a surprise opener and made not only a transphobic joke but a homophobic one."

Another fan said that they felt "ambushed" by Chappelle's appearance.

"[M]y favorite part of tonight was when dave chappelle ambushed us at the john mulaney show, told a bunch of transphobic jokes, a massive stadium of people laughed, and then john mulaney hugged him at the end," the user wrote.

One user — who identified as transgender — added, "Pretty disappointed in John Mulaney, saw him tonight and yeah, he was funny, but he gave Dave Chapelle the platform to make some transphobic jokes. Also very disheartening to hear a crowd of 12,000 around you (a trans person) laughing at transphobic jokes. Thanks Columbus."

Another wrote, "John Mulaney is not only responsible for platforming DC, but for yet another wave of cis a**holes yelling at trans people that we're overreacting and we deserve this treatment and cruelty. F***in sucks!!

One offended attendee told BuzzFeed News that Chappelle's jokes were "low-hanging fruit" for a "red state like Ohio."

"[Chappelle] was punching down on an already marginalized and institutionally abused community,” the fan told the outlet. “It was embarrassing seeing a revered man in his craft become so tacky and boomer-esque.”

The fan added, “It, unfortunately, makes sense — it was a low-hanging fruit of a joke in a red state like Ohio. In the end, he told the upset audience members to relax. The obvious grasp at trying to receive backlash and act shocked that he did receive ... it was embarrassing.”