I think he's talking about grinding down the entire surface, to level it with the others, maybe even from underneath. Not trying to round the edges, that'd be near impossible to do without scarring surrounding material. You'd have to take them out, one at a time, to do that. And you could still muck up that one just by letting the grinder get away from you. Just guessing here...
Whatever you do, don't try anything on your own yet (if that is what you are thinking). If FL is like CA, you must give the contractor a reasonable opportunity to make things right, or else you could easily lose any rights to a resolution.
The conversation/meeting is the first step.