It's worth noting this is only really true for imperialist nations and not for former colonies or periphery states. Social Democracy have their limits and issues, but they can often be genuine improvements in nations like Venezuela or Bolivia when they actually serve an anti-imperialist function (uniting the nation to kick out compradors and foreign capitalists and colonizers). Contrast this with Boric, who is a soc dem sell-out disconnected from the working class entirely who acts as a comprador - so they're not always good but have to be evaluated case-by-case basis.