Left Modernism is ubiquitous.
It is synonymous with American mainstream culture which is a composite mix of liberalism, modernism and cosmopolitanism. It is essentially what we are against.
Modernism rejects authority and tradition in favor of self-interest, self-expression, self-achievement, self-realization, self-fulfillment and self-advancement. It rejects the past in favor of the future. It is always trying to be new and shocking. It celebrates expressive individualism over collective duties and attachments. It is the ideology and perspective of deracinated and degenerate urban narcissists who feel like they are superior to their ancestors and owe nothing to future generations.
There is a scene in Game of Thrones in which Tywin Lannister dresses down his son Jamie Lannister the meaning of life. It is a great illustration of a premodern or anti-modernist worldview. Tywin believes in his family, house and dynasty and in loyalty and duty to these obligations. The modernist is someone who demands to be liberated from their obligations to other people.