Do not accept the ATC allegation. Slippage of his picture was entirely possible and in any case he was probably using secondary or processed-primary returns. He should aim to keep all the a/c under his control well inside his airspace (I think it's 3 miles?) - and you have every right to fly up to 1 molecule from his precious CTA....
He should withdraw his libellous statements.
ATCO, TWATCO! Idiots like him do not help Flight Safety in any way whatsoever.