You can see it’s still grammatically plural even when used as a singular with the other words that go around it too. “You are” instead of the singular “is”.
It can even make singular things kinda behave like they’re plurals. Like “The Lemmy user is posting comments” vs. “you, the Lemmy user are posting comments”
Back in the day it was “thou art posting comments” (singular) and “ye are posting comments”(plural). With “ye” becoming “you” over time. Although they also had more funky letters like ȝ and þ and stuff.