Theres two forms of off topicness in my eyes.
Silly/playful- thats how we get on tangents. they get
replies.
Boredom/Post Upping- thats the worst kind. they get
replies.
All in all, nothing ever happens and there aren't really any consequences, so why not admit it rather than screaming "victim", picking appart arguments, or bickering. And you two have the same powers to tell ppl they are off topic as I do.