Brian Austin Green has heated words for his ex Vanessa Marcil.

The BH90210 actor didn't hold back when he responded to her claim that she had raised their son Kassius, now 20, by herself following their 2003 breakup. Vanessa made the allegation in a recent Q&A on her Instagram Story, in which she replied to a fan's question about the former couple's co-parenting situation: "We didn't & don't co-parent. I raised my son alone."