I second the comment that ADD isn't an excuse to be rude.
Every person in our household is ADD.
We have an agreement; no phones during meals, dates, family time, bed, bath time (yes seriously had to make that clear).
Because it's too easy to interrupt yourself and it's NOT showing consideration for the people you are with.
There's hours available in a day. There's no reason not to SHUT IT OFF for a few hours.
Also-we have times when we have no phones for whole days. Same reason.
(and that goes for adults and children and all ages in between-youngest kid is 6, oldest adult in the household is 42)
"Love As Thou Wilt"