Jef appeared to first insult Arie after ABC announced September 7 on Good Morning America that the 35-year-old race car driver turned real estate agent from Scottsdale, AZ, will be starring on The Bachelor's 22nd season in 2018.
"Oh the stories I could tell..." Jef tweeted.
And then when The Bachelor creator Mike Fleiss thanked fans on Twitter for having "the most positive reaction" ever to the announcement of Arie's participation, Jef quipped in reply, "I'd rather see a double bachelor."
The specifics on why Jef and Arie's friendship crashed and burned are unclear, but Jef recently called him "disgusting."
Reality Steve spoiler blogger Steve Carbone posted a screenshot last week of one Twitter user bashing Arie, and he captioned the image with the following sarcastic message: "Most positive reaction the Bachelor has ever had!"
The screenshot featured a follower saying that Arie has a "gnarly reputation" in the Phoenix area and is a "luke-level f-ckboy." The user went on to call Arie's behavior with girls "gross," claiming he used to hook up with "sorority chicks" all the time and "banged a ton of 18-year-olds" while "wing-manning" for his pal Jef.
"Apparently the number of young college girls who have hooked up with [Arie], in one sorority chapter alone, is absolutely obscene. Him and Jef would make regular appearances at their parties," continued the follower.
And that's when Jef decided to put Arie on blast.
"I've actually never even been inside a sorority house," Jef wrote in the comments section of Carbone's post. "As for [Arie]... I stopped being friends with him years ago because he's disgusting."