The left denigrates an America that is itself largely a creation of the left, believing (or at least pretending to believe) that this leftist-created America is really "conservative." In reaction to the leftist denigration of America, conservatives celebrate this same America that is largely a creation of the left, also believing this leftist-created America to be "conservative."
If we get sucked into this political dynamic we are lost. We need to keep in mind that those on the left, no matter how much they like to think of themselves as dissenting outsiders, form an influential part of the political establishment.
Nor is it an adequate anti-leftism to react to this "dissent" by supporting every aspect of the modern West - as this means that we endorse much of what the left itself has brought about.