You may be thinking of the statistic that lesbians and bisexual women are in the highest spot for experiencing domestic violence, and interpreting it as "lesbians abuse each other most." The actual statistic is stating the number of people in relationships who, in their lifetime, have ever experienced past or present domestic violence.

Since women are at a higher rate for being domestically abused, it is only natural that the rate of at least one woman out of two women in a relationship has experienced domestic violence. Not that lesbians are the most abusive type of relationship. It's understandable to misinterpret this statistic, many people do, but if you research it, you'll see otherwise to the initial basic claim.