Arron responded angrily to Lydia's comment and ended up calling Andy Scott-Lee's girlfriend a "f**king weirdo".
Speaking about the row later in the garden, Lydia said: "Did you hear what he said? He called me a 'f**king weirdo'. I told him again I wasn't having a go at him and he called me a 'f**king weirdo'.
"He wants to look like the big I am in front of the boys. If I don't answer back he doesn't get to have that confrontation. In fact, he looks like a p***y."
She continued: "Go pick on someone your own size. Go pick on a boy. What a p***y! Go after the boys. Grow a pair of balls. Don't pick on a girl. How pathetic."
Lydia is up for eviction this week alongside Deana Uppal.
Big Brother continues daily on Channel 5.
Photo Gallery - Big Brother Day 21:
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