The Brief: Wendy's posted a viral Twitter thread in which they mercilessly roast anyone who asks for it.

DEEP DIVE
Wendy’s Roast
The fast-food chain Wendy’s has been flexing its meme literacy on Twitter, creating #NationalRoastDay with their epic roasts. Its Twitter bio reads “We like our tweets the same way we like to make hamburgers: better than anyone expects from a fast food joint.”
On Jan. 5, 2019, Wendy’s Tweeted “It’s go time! You want the roast? Then let’s go! #NationalRoastDay,” prompting people to reply so that Wendy’s would roast them. Roasting refers to dragging someone or to playfully but harshly insult someone or something. This tweet has gone viral with Wendy’s sharp and devastating roasts, shade thrown, tea spilled, and wigs snatched.
A dig at Jacsepticeye for not being in YouTube Rewind:
Loved your bit in YouTube Rewind this year.
— Wendy's (@Wendys) January 4, 2019
An insult to both Fortnite commentator CouRageJD and to Ninja‘s cringey failed attempt to get people to floss at the New Year’s Eve celebration in Times Square:
You're the only dude that flossed when Ninja asked you to.
— Wendy's (@Wendys) January 4, 2019
A jab at this internet browser’s bugs:
Sorry it took so long. Firefox encountered a problem with Windows.
— Wendy's (@Wendys) January 4, 2019
A solid appearance-based drag:
Saw your avi and we understand why you're a voice actor #NationalRoastDay
— Wendy's (@Wendys) January 4, 2019
Bronies are low-hanging fruit when it comes to internet insults:
You already exist so there's really no topping that.
— Wendy's (@Wendys) January 4, 2019
Beef between brands:
Sorry for always trading you for something better on Halloween.
— Wendy's (@Wendys) January 4, 2019
Ok, Wendy – you don’t have the best dye job either…
Roots looking like the forest floor. 😉 #NationalRoastDay
— Wendy's (@Wendys) January 4, 2019
Roasting someone’s occupation:
#Millennial Staffing Star owner? What do your parents tell their friends you do? #NationalRoastDay
— Wendy's (@Wendys) January 4, 2019
Some people have been roasting Wendy’s right back, and hopefully, everyone involved can take a joke. This sort of online roasting is a popular form of banter. Although it’s not always done in good fun, it seems that Wendy’s roast has been friendly and entertaining for both roasters, roastees, and viewers smart enough to stay out of it.