Bekah, a 22-year-old nanny from California, began tweeting about her low opinion of Arie and frustrations with him towards the end of Monday night's The Bachelor finale.
Bekah began firing away at the 36-year-old pro racing driver by posting a photo of them in a hot tub from their first one-on-one date during the season. In the photo, Bekah's eyes were wide and she was flashing a bit of an awkward toothy smile.
"That moment when you realize you dodged a bullet @ariejr," the bachelorette wrote.
Monday night's finale of The Bachelor featured Arie proposing to Bekah's friend Becca Kufrin at the final Rose Ceremony in Peru, only to dump her weeks later during what was supposed to be a "happy couple visit" in Los Angeles.
The breakup was excruciating, as fans watched a long, unedited and uncut scene of Becca sobbing into her hands and hyperventilating as Arie kept repeating that he was still in love with his runner-up, Lauren Burnham, and couldn't stop thinking about her.
"Yo dude when you break off an engagement for your other ex gf the least you can do is LEAVE when she tells you to f-cking GET OUT," Bekah tweeted, referencing the moments Becca asked Arie to leave her alone but he'd stay and continue pushing for more conversation and closure.
"Hahahahahaha [Arie] is the biggest f-cking tool i've ever seen. becca is a queen. a goddess. thank the LORD he's out of her life."
Bekah then called Arie out for previously sending her direct messages on Instagram in early February while The Bachelor was airing.
Arie first commented on Bekah's appearance on a missing persons list, and then the next day, he sent her an old high-school prom photo and joked about how she was born that same year.
"DM'ing your ex on twitter is a great look too," Bekah tweeted along with a winking face and the screenshots of her exchanges with Arie. "#teampetty #teambecca."
However, Bekah has received some criticism for making a big deal out of nothing. Some of her followers viewed Arie's messages as an attempt to remain on good terms and wish her well.
"Yeah arie was probably being friendly but guess what I DONT CARE HAHAHA, BOY BYEEEEE," Bekah wrote Monday on Twitter.
The second part of The Bachelor's Season 22 finale is set to air Tuesday night as an After the Final Rose special from 8-10PM ET/PT.