I think you're reading it wrong. @Brian0964 is asking @DNI_Ratcliffe to follow @Johnheretohelp. As long as you're not blocked, you can tag anyone in a post. There's no indication Ratcliffe follows @Johnheretohelp.
Check this twitter post I just made: Richard Kimball post to bagster and Alyssa Milano
The fact I tagged people, I follow bagster, don't follow Milano, doesn't mean they have any relationship with each other or me.
Correct, see post 478. Just asked for post 475 to be removed.