How to Stop one users ipad from backing up to My User iTunes

Question

I have 3 Users on the mac.
We each have either an iPhone, iPad or iPad mini.
They often all stayed plugged in for charging when not in use.
When I open my user name iTunes, I want to jsut see and backup just my devices.
is the a way to just select which devices connect to my user iTunes

Answer 1

Ah, OK, I'll try again.  I went straight to the question, avoiding all the irrelevant distractions associated with so many posts, in order to prevent the thread going off on a tangent.  But I can see that that won't work.
Getting the irrelevant stuff out the way first:
MacTower with 6 USB PORTS, 4 on the back, two on the front.  No hubs.  All devices charge just fine.
3 different Users of the Mac, each with their own loggin Username.  Two of them are computer incompetent, and just can't seem to look at iTunes when there are different iDevices plugged in without choosing or otherwise changing sync settings of devices that are not theirs.... despite the fact they are named with their own names.
So, back to the question.
3 different iDevices ( iPod, iPad & iPhone) are all plugged in.
Each device belongs to different User
User A comes along and logs in
Fires up iTunes
iTunes recognises all three devices and connects to them all
iTunes  backs  up a each connected device, and shows them all in the sidebar.
I want to set iTunes up so it only backups Users A's device.
Better still, not have Users B&C's devices appear when logged in as User A