Meh, depends. Libertarianism isn't as rigid a philosophy as most, so frankly value systems and positions can vary. Left-libertarians, such as Bill Maher, Peter Joseph, and Noam Chomsky have no issue working with liberals torwards common goals. And left-libertarian organizations such as the Democratic Freedom Caucus, the ACLU, and the Venus Project have made a massive impact on the movement and have made impressive steps towards our shared goals. In Florida CD 13 progressives and libertarians lined up behind the Libertarian Party candidate, Lucas Overby, a self-described "left-atarian", to oust David Jolly. Libertarians and liberals aren't such strange bedfellows, it's just a matter of realizing that libertarians are far more diverse and open-minded than Fox News (which desperately tries to use them to bring more votes into the GOP) would have you believe.(BTW, if that's actually true, then they are welcome to join us. We would have some major disagreements to sort out, however...)
I can understand liberal/progressive condemnation of libertarianism, as here in the US the term libertarian has come to be a term to describe worship of the free market. But historically and internationally libertarian ideas are very much entrenched on the left, taking form in communist, socialist, and mutualist (market socialist) ideologies. The thought behind this is that the feudalism and corporate oligarchy that results from unfettered capitalism is not actually compatible with an idea that seeks individual liberty and personal autonomy.