In general, I find the term "democratic socialism" to be pretty cringe. It's like saying right up front "I'm not like those OTHER socialists!" Socialism is a liberatory project. Socialism is the auto-emancipation of the working class. THAT is what democracy looks like. Rule of the people.
Liberation comes hand in hand with revolution though. Socialism will certainly NOT be very democratic for the people who own vast amounts of real estate, productive machinery, and ~~propaganda~~ media empires. Those people will certainly need to end up on the wrong side of a gun for the project to succeed. The wise ones among them won't force us to pull the trigger.
It will be a hostile take-over. It will be a break from the constitutional order. It will be a break from the "rule of law." When the ruling class starts losing the game, they will flip over the table. All your precious civil liberties will be torn to shreds. Fascism is simply capitalism under crisis.
The Liberals commit themselves to playing by the rules even when the fascists never would. Salvador Allende (the world's first elected Marxist head of state) tried to do this, and in three years it ended in his death and a fascist military dictatorship. There is no room for idealism in revolution. The stakes are very real. You need to crush your enemies by any means necessary. Maybe you don't give Rupert Murdoch the freedom of speech. Maybe you don't respect Jeff Bezos's property rights. Maybe you stuff all the Proud Boys into a mineshaft.
A lot of people whine about authoritarianism in the English speaking left, but the English-speaking left has no power to speak of. Just a bunch of very online sectarians bickering. We run around trying to cancel internet forums which amount to little more than fucking book clubs, as if they were the embodiment of high Stalinism.
Liberalism has an actual definition, and it is not the colloquial definition used in mass-media to refer to "the left half of what is acceptable."
Liberalism is an idealist (another word which has a very specific definition) political philosophy which champions private property, constitutionalism, republicanism, rule of law, and free trade. It has a philosophical canon, flowing through writers like Locke, Montesquieu, Mirabeau, Rousseau, Paine, etc. Further economic works, like Smith's "Wealth of Nations," are built on this philosophical underpinning.
Marxists are materialists. This is in contrast with the idealism of Liberals. While Liberals believe ideas are the force which drives change in the material world, Marxists understand that ideas are just a reflection of the material conditions they emerge from.
Liberals find themselves banging their heads against the walls of the institutions time and time again, because from their perspective, these institutions are just a reflection of ideas, and as long as the justification for an institution on paper is sound, there is no reason to think it cannot be reformed. An institution like the US Congress, or the Executive Branch is never at fault. It is simply a good institution simply being run by bad people. Marxists (and Anarchists) reject this quite simply, by looking at the material incentives involved, and the long ghastly history surrounding these institutions.
"Combating liberalism" does not mean being a piece of shit to anybody to the right of Bernie Sanders or Jeromy Corbin. There is a genuine struggle to ensure the new crop of social media platforms don't simply end up defending the legitimacy of the established institutions at the expense of genuine radicals who find themselves at odds with the actual longstanding policy and practices of these institutions. To avoid situations like when mastodon.lol banned CODEPINK, a prominent anti-war organization, for being "Tankies." This is Liberalism, and it should be combated.