You are welcome to disagree with it, but your definition is not shared by Merriam-Webster, Dictionary.com, or Wikipedia. The Encyclopedia Britannica comes closest to agreeing with you by saying that, “Socialism is the standard leftist ideology in most countries of the world,” but it does not limit its definition of the political left to socialist and communist ideologies, and it certainly doesn’t say, “Left wing means ending Capitalism, not just 'reigning it in.” So maybe next time, before you jump into someone’s comments to tell them they’re using a word wrong, check if they’re actually using it wrong or simply using it in a way that doesn’t align with your personal beliefs.
You:
Wikipedia:
Anyway, we’re done here.