"Remembering the summary execution,widespread rape and theft committed by these'brave'Anzacs in Egypt,Palestine and Japan,"he wrote to his 30,000 followers.
"Not forgetting that the largest single-day terrorist attacks in history were committed by this nation&their allies in Hiroshima&Nagasaki."
Communications Minister Malcolm Turnbull took the unusual step of criticising the presenter on Twitter.
"Difficult to think of more offensive or inappropriate comments,"Mr Turnbull tweeted.
"Despicable remarks which deserve to be condemned."
But some commentators defended McIntyre's right to free speech. Ten News'Hugh Riminton tweeted that the presenter's comments were"untimely,immature and in one case offensively wrong. But lest we forget,Our Diggers also died for free speech."
Riminton is on the board of charity organisation Soldier On Australia,which supports Australian servicemen and women who have been physically and psychologically wounded in conflicts.