Liberals use words like "conservative" as epithets to disparage and discredit any views opposing Liberalism. In a typical news story, if opposing views are presented, the liberal view will be portrayed as mainstream, i.e., unmarked. A conservative view will be specifically marked, so viewers or readers know that it's not considered mainstream.
The basis for this is the liberal delusion that liberalism is mainstream, and that conservatism is "far right". Part of this is the motive to smear modern conservatism with connotations of Nazi Fascism.