EXAMPLES FROM THE WEB FOR RED RAG
Just now the very mention of the highgrader's name was a red rag to his temper.
In the daytime a red rag is sometimes attached to it, I was told by the carpenter.
Drive on, Tom, and here's a red rag to flap at the old thing.
Since Culloden the word had been to him as a red rag to a bull.
A camp fire to an angry elephant is the equivalent of a red rag to a bull.
He had unconsciously been waiting for that word, than which none was more like a red rag to him.
He cum an' he go'd; but he kep his red rag to himself, he did.
To the other side, that bandage was like a red rag to a bull.
If the deceased has fallen in battle a red rag is fixed on the pole as well.
You mean he toled them near enough with a red rag to pot-shoot them.