Clearly it feels meaningful to the person saying it, but it's not clear the meaning can be successfully conveyed to someone else, at least not in concrete terms. Certainly as a feeling, or mood, or an essence, but not something objective, rather than abstract.
Yes, I think it does feel meaningful to the people having these conversations between themselves and they also shortcut them by saying "I know exactly what you mean" and never demanding logical articulations. So the left gets lazy at articulating its positions and leaves people in a situation where it's so frustrating because they're thinking, 'I know I'm right, I know this is true,' but they can't actually make it make sense to another person. And they think that their interlocutor is being deliberately obtuse or stupid or unfair in not understanding, or they impute to their opponent something which they think is the opposite of their own meaning.
That's usually something along the lines of 'oh so you're racist/don't care about women/want poor people to starve,' i.e. 'you're bad.' Which logically suggests that the inarticulated feeling driving the leftist's words boils down to something like, 'I'm good; this is what good people think.'
Which is exactly what HJ said in the discussion, and others have reprised here: the idea that left = good and right/anything else = bad. And when you believe you're good, then you also may feel entitled to silence others, to condemn others, to blame others and to hate others. Because they're bad, so it's fair, and you're still good. In fact, the more you silence and condemn others, the more it consolidates the feeling that you're good. And everyone around you understands, and says, 'I know exactly what you mean,' and no one demands a logical articulation of, e.g., why you hate Posie Parker so much. They just get it. And those who don't get it are bad people. And so it goes.
It has an internal drive that is hard to resist. It's self-perpetuating and comforting. But it's very frustrating when you're talking with people who don't automatically get what you mean, or feel how you feel, because you're not in the habit of using logic and argumentation. You may be right, but you can't say why or convince anyone who doesn't already agree with you. I've definitely had that experience and it led me to change my mind about various things. I realised that I was expressing ideas and opinions without really knowing where they'd come from. In a way, that's part of the difficulty, because it feels like they've arisen independently in me, and that they're my ideas. It's only when I really started to interrogate myself about why I believed some of the things I believed that I realised I couldn't say exactly why. I just did: like a faith or a dogma. Just growing up in that leftist type of environment and a lot of ignorance.
Sorry this is turning into a very long post. But a while ago I was at a week long course with a bunch of people I'd never met before, and I started getting really weirded out because they all said the same things all the time. Whenever the conversation veered towards politics, they all said the exact same things, independently of one another. It was weird and also it was so boring. I longed for someone to say they'd voted remain or thought that people on strike were being irresponsible - just anything other than churning out the same opinions as everyone else. Received opinions, I think is the term for it. I thought, no wonder people feel so lonely and disconnected. Because instead of making genuine connections with others, they are sharing these phrases and opinions that are the same as everyone else's phrases and opinions. They were all very lovely people, but I refused to get into a 'serious' conversation with any of them and spent the whole week trying to get them to play games, drink wine, talk about their childhood trauma - anything!! Maybe I should have been the one to stir the pot a bit, but I didn't fancy being rounded on by twenty irate leftists.