There are vulgar Marxists, vulgar libertarians and I think there are vulgar liberals.
Liberalism at its heart is about allowing people to take control over their own lives. Many liberals advocate the state taking a role in ensuring this, something which is well within the liberal tradition, others consider the state to do more harm than good when it acts or see the acts to enable people as being attempts to reverse previous state actions which created the problem in the first place.
All these views, nuanced in innumerable different ways are part of the liberal school of thought.
The vulgar liberal takes state action as a matter of faith but goes even further and turns state enabling into state support. Rather than the state enabling you to be free, the state becomes your guardian, and state action becomes an end in itself.
Take the example of the welfare state - aspects can be supported by appeal to the state enabling people to take control over their lives, but for the vulgar liberal the welfare state is in itself an end.
This is also seen in local politics as a perversion of community politics. Rather than seeking to enable people and the communities they belong to to deal with their own problems, the vulgar liberal seeks to solve the problems for them.
This attitude easily leads to a paternalistic view, that the state must provide for people and then use its force to make people behave in a desirable way. This is always for the person’s own good, at least in the eyes of the vulgar liberal, something which makes the vulgar liberal all the more frustrating.
The liberal and vulgar liberal both agree that people should not be enslaved by poverty or ignorance. They will often both profess to believe that people should not be enslaved by conformity, although the vulgar liberal will often mean this only to be in the realm of culture (in the case of other areas of your life they will insist you conform to their standards, for your own good).
The liberal however will realise that just as the starving man is enslaved by his hunger and grinding poverty enslaves people, those who depend upon the state are enslaved by that dependency.
The vulgar liberal can be very frustrating for the liberal. They are so close, they value freedom, but they don’t see that their attachment to state action as an end in itself can enslave people (just as the vulgar libertarian doesn’t see that the constraints of the unfree situation restrain the freedom of many, especially the poor).