I don't know where you're coming from but around here claiming that is about the worst kind of insult you can make. Claiming you stole someone else's work without any kind of attribution is yelling bloody murder. This has been going on for 10 years now, and still no-one has cared to point a shred of evidence to back these claims up.
Insult or accusation whichever, if that's about the worst kind of insult someone can make at you then and as you say it's been going on for 10 years then who's the daftest one out of the pair of you... Dave for continuing with these "insults" or you for responding to them for 10 years...
Time to realise that were talking minor league stuff here guys that 99.99% of the world couldn't give a crap about (or even know what the frig it's all about in the first place) why not just ignore each other and get on with what you enjoy in life rather than behaving like a couple of old fools who are still in a huff with each other cos you both fell out over a storm in a teacup...
Take a chill pill, put yer feet up and say Wibble, you'll feel much better for it... honest...
PS:Im pretty sure there are worse things to be "accused" of and if not then you really need to speak to someone...