From what I could get from a quick search, you seem to have the origin correct.
If I had to compare, I’d say it’s like the text version of Dick Butt, a simple exploitable that can be applied to anything featuring something like a note. And a few simpe searches show me it has the necessary spread.
So yeah, +1 on creating an entry here.
well from what I’ve seen of it
U R A FAGGOT =/= ur a faggot
has been used for a long time
there are few posted in OP is a fag because there really is no where else to put em
But “ur a faggot” is going to be difficult to pinpoint where it came from who used it first