I have no problem with businesses raising their prices in order to do business. Offering health insurance to employees is part of that.
Having said that, I would rather they just raise the prices, don't put on a surcharge for X,Y,Z for employees this or that on the receipt.
IMO I think that will hurt those employees. Nobody would question a 3% increase in their bill, in fact I doubt most people would notice it.
However when you put it as a surcharge for specific employee benefits, I think customers are going to tip less because they will think- well I'm paying 3% extra for their health insurance now, I don't need to tip them so much. Not all customers and maybe it won't make a difference at all, but I think there are enough out there where it might in the long run.