Brian Austin Green has heated words for his ex Vanessa Marcil

Brian Austin Green has decided to call out his ex Vanessa Marcil after she claimed that she raised their son Kassius "alone" following their 2003 split.

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."

Posting a screenshot of the actress' answer, Brian wrote on Feb. 24, "So, I can't tell you all how frustrating it is to read continued lies from a 50+ year old woman on social media like she is still in high school. She has never in her life been someone to walk the walk. Talk is cheap."

Brian—who also shares three sons with ex-wife Megan Fox, as well as a 7-month-old baby boy named Zane with girlfriend Sharna Burgess—went on to claim that he was the one who did most of the parenting in their dynamic.

"Megan and I bust our asses to give Kass a well rounded childhood since his mom was rarely there," he wrote. "I'm assuming that's why she posts so much of him now. When will she just GO AWAY."