The pair clashed as Jade-Martina Lynch tried to hold a peaceful meditation session for the group.
"Why is Joel there, he's just taking the piss, he's really winding me up today, he keeps digging and just needs to stop," complained Aaron over Joel's perceived lack of seriousness towards Jade's efforts.
As Jade's Meditation session got underway in the garden it didn't take long for Joel's giggling to disrupt the peace, although he insisted it wasn't anything to do with him.
"I just seen you fricking do it," snapped Aaron.
He hit out at Joel: "You're really inconsiderate. I told you in there [in the house], if you're going to take part be serious about it.
"You took the piss in there and you're doing it out here [in the garden]. You're being really immature about it. You're just being a ****."
However not long after and Aaron approached Joel for an awkward apology.
"Looking back on that situation, I didn't know where it came from, it didn't mean to come across as nasty, I just snapped for no reason," Aaron explained. "I apologise."
It's not the first time that Aaron has lost it just days into his stay.
On Thursday night he was left upset after comments Chloe Wilburn said it took her time to warm to him.
She told him: "At first I thought ‘I just don’t get this personality’ but now I’ve realised you’re really funny."
However it left Aaron in tears as he branded Chloe "rude".
BBUK continues nightly on Channel 5.