Nope, the opposite, in fact. It still tags, but because it starts with something other than a tag, it's a normal tweet instead of a response tweet. Basically, makes it more visible, so everyone else can see that he's responding, and what he's saying.
Pretty sure it nullifies the tag so the other person doesn’t actually get notified, not sure though never been much of a twit
Nope, the opposite, in fact. It still tags, but because it starts with something other than a tag, it's a normal tweet instead of a response tweet. Basically, makes it more visible, so everyone else can see that he's responding, and what he's saying.