"doesn't mean he doesn't know his shit. And as long as you keep on whitewashing the truth, I'm sure you'll never hear the multi-colored end of it"

I agree you must look at the multi-coloured end of it. That means don't just white wash events or in fact don't just blacken events. Of the historians I have quoted one was born of an Irish family in Scotland whilst the other was born to an Irish family in Dublin and was brought up and educated there. Both studied and are qualified in both Irish and British history to the highest level! Presumably they know their shit too! Conoe Cruise O'Brien was just one of those to critiqe Foster's work. "A magnificent book. It supercedes all other accounts of modern Irish history".

If it is going to be dismissed as whitewashing then you really have to come up with some argument other than existing ingrained feeling and the idea that some bloke on the net probably knows his shit!