If you yell at your ex or child in a custody battle, the court may view it as a sign that you cannot effectively co-parent. The court may also view it as a sign of parental conflict, which can harm children. In some cases, the court may even order a psychological evaluation to determine whether or not yelling is part of a pattern of abusive behaviour. Ultimately, yelling at your child in a custody battle can backfire and may damage your chances of winning custody.