M.C.
Good Morning Dawn,
My third of four children did basically the same thing but...it was his thumb. He never sucked his thumb until he went to a program that was two mornings a week and one child sucked her thumb so...
My thinking is that your son in involved with a group of children who are still allowed to have the pacifier so you standing your ground is not going to make things comfortable for him or the others. If he was 14 years I would say stand your ground because you will not always want to allow behaviors just because the other kids are allowed but...he's 14 months and you can't even reason with him yet. Either change groups for him or for now go with the flow and start weening him when he is home during the day and keep explaining to him that the paci is for the time he is with his friends. No it won't be easy because as I said he cannot reason yet but...when he's 14 years it won't be easy either. This approach (a gentle tough love) will be the beginning of you determining what will be allowed and him understanding you make the rules but don't expect him to grasp your thinking right away he's pretty young. Good Luck and go gently.
M. C