So I take it I may use the pronoun ‘you?’ instead?
The guideline is to "discuss the issues all you want, but do not make it personal."
"Making it personal" includes reading the mind of another Freeper or attributing motives to him. It also includes making the thread "about" another Freeper, personally.
Basically, avoid ad hominems altogether. Discuss the message not the messenger.
If you are unsure whether your post is "making it personal" - examine your use of the pronoun "you" and either reword those sentences or remove them. But do not substitute another word or phrase for the "you" because that would still be "making it pesonal."