LTD, you did exactly the right thing and I would have done the same.
'Cowboys' is a highly appropriate and perhaps overly polite description of these pilots actions.
I don't take off without a clean wing, full stop.If someone had pointed out to me that was not the case I would have thanked them and had the de icing repeated.
I doubt too many real 'Cowboys' are surfing the Pprune, or would be offended, if so perhaps they could p**s off where the Buffalo roam..