Because Arin Hansen declared his undying love for Wendy's, and now it's an official ship.

That (above) and also the Wendy's twitter has suddenly became the QUEEN and KING of fast food meme pages
They went from their "Eat Spicy Goodness, Like a Boss" commercial to "Here is a medium-rare Pepe"
Wendy's is basically knife cat but surrounded by knives too

Basically, whoever runs Wendy's twitter is the sassiest person ever, and now everybody is attributing that to how "Wendy" (the mascot) actually is.

Their twitter is a sassy bitch.