Liberals view the status quo (the underlying mechanisms of the government, economy and society) as sacrosanct, legitimate, that it just needs to and will allow itself to be tweaked a bit, that the rules must be followed lest we collapse into chaos.

Leftists view the status quo as widely illegitimate, that a vast multitude of the rules which society operates by are contemptible and functionally evil, and are willing to break the rules to meaningfully change society, that often the entire point is that breaking rules is the only way to establish newer and more just ones.

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Liberals view Leftists as an extreme part of their fold because they often have similar goals.

Leftists view Liberals as often sharing goals, but as ultimately delusional, magical-thinking self righteous fools, as their methods of achieving these often similar goals are laughably naive, impotent and ineffective, thus functionally making them into conservatives.