> I'm not American, but the Democratic party self-describes as social-liberal.

Social-liberal isn't socialist. I live in a liberal-social democracy, but very few workers own the means of production here.

> but only you here seem to have attached stigma to the word.

American society as a whole has attached a stigma to it. Claiming otherwise is either disingenuous or ignorant, I'll let you take your pick as you listen to the dulcet tones of Ronald Reagan disclaiming the dangers of socialised medicine. https://www.youtube.com/watch?v=AYrlDlrLDSQ