You're right. I offer two points in my defence. The sibling comment already had solid evidence. And I didn't think telling someone to stop lying constituted "personal abuse". I considered GP's comment a lie by omission.
But you're correct that this type of comment isn't good for the site and I'll be more mindful.
Thanks. It's fine to disagree and respond with opposing arguments, we just don't want the swipes, and the guidelines ask us to "assume good faith", even when it's hard. If others are breaking the guidelines, you can flag their comments and/or email us.
But you're correct that this type of comment isn't good for the site and I'll be more mindful.