"red flag in front of a bull" meaning in English

{
  "etymology_text": "A metaphor for the muleta used by bullfighters.",
  "head_templates": [
    {
      "args": {
        "1": "?"
      },
      "expansion": "red flag in front of a bull",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Anger",
          "orig": "en:Anger",
          "parents": [
            "Emotions",
            "Mind",
            "Human",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "examples": [
        {
          "ref": "2007, Georgina Gentry, To Love a Texan, page 63",
          "text": "That message always acted like a red flag to a bull and they charged in, determined to hog-tie him and put a wedding ring through his nose.",
          "type": "quotation"
        },
        {
          "ref": "2008, John Calvert, Another Sort of Life",
          "text": "Of course his complicated financial dealings must have been a direct provocation to the IRS, a red flag in front of a bull.",
          "type": "quotation"
        },
        {
          "ref": "2012, Henrik Bogdan, Martin P. Starr, Aleister Crowley and Western Esotericism",
          "text": "To a committed individualist such as Norton, this was truly a case of “waving a red flag at a bull,” and although there was undeniably a certain amount of overblown and probably mock-offended rhetoric in her response, equally there is no doubt that many of the objections she raised were her sincerely held opinions",
          "type": "quotation"
        },
        {
          "ref": "2012, Kresley Cole, Lothaire",
          "text": "Yes, his mocking stung, but he hadn't cowed her; he'd just waved a red flag in front of a bull.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "Synonym of red rag to a bull"
      ],
      "id": "en-red_flag_in_front_of_a_bull-en-noun-K090DKxe",
      "links": [
        [
          "red rag to a bull",
          "red rag to a bull#English"
        ]
      ],
      "synonyms": [
        {
          "tags": [
            "synonym",
            "synonym-of"
          ],
          "word": "red rag to a bull"
        }
      ]
    }
  ],
  "word": "red flag in front of a bull"
}

{
  "etymology_text": "A metaphor for the muleta used by bullfighters.",
  "head_templates": [
    {
      "args": {
        "1": "?"
      },
      "expansion": "red flag in front of a bull",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "English nouns with unknown or uncertain plurals",
        "English terms with quotations",
        "en:Anger"
      ],
      "examples": [
        {
          "ref": "2007, Georgina Gentry, To Love a Texan, page 63",
          "text": "That message always acted like a red flag to a bull and they charged in, determined to hog-tie him and put a wedding ring through his nose.",
          "type": "quotation"
        },
        {
          "ref": "2008, John Calvert, Another Sort of Life",
          "text": "Of course his complicated financial dealings must have been a direct provocation to the IRS, a red flag in front of a bull.",
          "type": "quotation"
        },
        {
          "ref": "2012, Henrik Bogdan, Martin P. Starr, Aleister Crowley and Western Esotericism",
          "text": "To a committed individualist such as Norton, this was truly a case of “waving a red flag at a bull,” and although there was undeniably a certain amount of overblown and probably mock-offended rhetoric in her response, equally there is no doubt that many of the objections she raised were her sincerely held opinions",
          "type": "quotation"
        },
        {
          "ref": "2012, Kresley Cole, Lothaire",
          "text": "Yes, his mocking stung, but he hadn't cowed her; he'd just waved a red flag in front of a bull.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "Synonym of red rag to a bull"
      ],
      "links": [
        [
          "red rag to a bull",
          "red rag to a bull#English"
        ]
      ],
      "synonyms": [
        {
          "tags": [
            "synonym",
            "synonym-of"
          ],
          "word": "red rag to a bull"
        }
      ]
    }
  ],
  "word": "red flag in front of a bull"
}