It's a pretty well known phrase in the US (I don't know where you're from). Capitalist countries throw out rights and institute reactionary/fascist dictatorships to rediscipline the working class and the quote was the first thing I thought of to explain my views on what it would take for the US to revoke them. It's not literally true but it's spiritually true. Those rights were given out a concessions and are subject to change or being revoked like abortion.

Ultimately, we're in a very far left internet space and if I was talking to a "normal person" I'd gauge their politics and try to figure out how to talk to them without seeming weird.