Girl Misunderstands Boyfriend's Compliment That She Is "Sow-like"

A couple having desert in a coffee shop last night got into a dispute when the boyfriend described the way his girlfriend watched over and enjoyed her portion of the desert as sow like. Specifically, the couple was eating a couple cookies and he referred to her as a cookie sow. The girlfriend took great offense to this, arguing that he was essentially calling her a pig and making not so veiled comments about her weight. The boyfriend said that he was not making any claims about her weight, just about how closely she guarded her cookie to prevent him from stealing pieces, much as a mother sow, in this case referring to a mother bear, might watch over her young. He said that there was no more dangerous animal that a startled mother sow watching over her young, and that he'd really meant it as a compliment about how protective she could be.
The girlfriend said that if he'd really wanted to offer her a compliment and imply that she was a dangerous guardian of her cookie he could have called her a cookie panther, or a cookie tiger. She said he'd specifically chosen cookie sow because of its defendable double meaning, which allowed him to make a passive aggressive attack on her weight all with the hope of actually getting her to voluntarily give up a portion of her cookie to him. She said that if he wanted part of her cookie that badly he should just come right out and say, you're too fat to eat all of that cookie, give me half.
He said that her belief that his comments had anything to do with wanting part of her cookie was typically over-protective behavior, and only underscored how sow-like she was being.
She said that he was an ass and invited him to take it any way he wished.