"I wasn't engaged #bachelorinparadiseabc," Joe, 34, tweeted during the episode.
Joe subsequently "liked" a tweet poking fun at Kendall's Bachelor in Paradise entrance, Us Weekly reported.
When Kendall stepped on the beach in a stunning red crop top and skirt during last week's episode, she approached Joe while he was lounging on a daybed with Serena Pitt and other cast members.
"Hey butthead," Kendall said.
"Hi," Joe replied.
"Want to go talk?" Kendall asked.
"Yeah," Joe responded with a smile.
The tweet read, "That 'hey butthead' line made me wanna cut my eyeballs and ears off #BachelorInParadise."
When Kendall and Joe sat down for a chat -- with Serena, Joe's BIP Season 7 love interest, watching from a distance -- Joe admitted to his ex that staying in Paradise was a tough decision to make because they were "really in love" and happened to fall in love on that exact beach.
"It's difficult for me to not have you be a part of my life. I do want you in my life... in some capacity, and it's hard to not have that," Kendall said with tears in her eyes.
RELATED LINK: 'THE BACHELOR' FRANCHISE COUPLES NOW
"You try to move on, but for some reason, it doesn't feel right and it's hard to... At first, I was absolutely terrified of coming."
Kendall explained their early 2020 breakup was difficult for her because they never fell out of love -- it was logistics that broke them apart, meaning Kendall wanted to continue living in Los Angeles, CA, and Joe desired moving back to his hometown of Chicago, IL.
"I still love Joe," Kendall told the cameras in a confessional, "and I hope he still has love for me."
Kendall explained how she couldn't accept having zero communication with Joe after he was her "everything" during their relationship.
"What happened was we broke up, we fought... we had our differences... but then I came back to [Los Angeles] four months after and I was pushing to have that conversation," Joe recalled.
"You were pushing to have me move to Chicago," Kendall argued.
"I was pushing to have you try -- yeah, to come move to the city where I grew up in, where my friends and family are. I think if you just would've tried, we could've figured something out," Joe explained.
Kendall said things probably would've ended the same way because she had made it clear from the start of their relationship that moving away from her hometown was "a dealbreaker" for her.
"I wasn't going to change my mind and I think you were hoping I would," Kendall said.
"Your thing was that you didn't want to move anywhere for a man... I should've been more than just 'a man' at that point, and we could've tried it," Joe said.
Although Kendall suggested she may want to get back together with Joe, she also said she just needed closure from him so that she could move on with her life, which left Joe feeling confused.
"I don't know if I still love Kendall. I'm telling you the truth... I have something going on with Serena that I don't want to just throw away. I don't. This is messy. I need to figure out what to do," Joe lamented in a confessional, adding that he felt "confused" and his reunion with Kendall was "going to be a problem."
Joe ultimately determined he wanted to continuing pursuing his romance with Serena, even though Kendall would begin dating other men on the same beach.
Joe wasn't exactly sure what Kendall's intentions were, but he assured Serena -- who broke up with Matt James on The Bachelor's 25th season after her hometown date -- that she was his "main priority."