Then that is clearly an open cause for friction when you live and work alongside non-muslims.
Peace is a lot of work, Psyah. It isn't only about starting posts with "Peace."
That's true it is a lot of work ... part of peace is agreement and here I agree with you ... Peace
Please note: Even though we hold that kaafir may be a befitting title for disbelievers at the same time we must humble ourselves and offer them our love, and help and brotherhood. For all we know their accountability could be less than ours and for all we know they could have done something that Allah liked and for all we know they may have that mustard grain of faith ... we are not to use the term Kaafir as a label to discriminate any particular person.
Have I ever called you by the term? I may hold a certain belief but that has nothing to do with the way I treat you ... however, your conduct may have friction towards me based on what I believe but you see then the peace hopefully will still be sent your way ... even if you decide to show me friction and May Allah (SWT) help me to do this.