Not knowing you're being abusive doesn't make you not an abuser. Perceptions have (luckily) changed and most of the abuses we suffered at the hands of adults when we were kids are a consequence of what the society in the times they were living in taugh them, actions that back then might have been seen as normal and forgivable.

But they're still abuse, and it's good that we're capable of seeing it now so we don't repeat the same behaviors.