@TatianaBis, what I mean is, conversations aren't purely about the subject, are they?
When I first met my partner, we went to a dinner, and the people sitting with us talked to me about their jobs. One of them was talking about how she might fit her career around possible children; the other was trying to figure out whether she might move abroad. All of this was discussed in relation to their specific work, but it was also a general topic.
I chatted back; my partner barely said a word.
There are reasons for this. She grew up with no experience of jobs that weren't shift work or possibly 9-5; there was no sense of a career; no one would talk about moving abroad. As it happened, she was more senior in her line of work than the two women we'd been chatting to, and they were both hoping to break into her area. But if you'd heard our conversation, you'd never think she was either intelligent or knowledgeable, because she barely opened her mouth.
That's what I mean by making the right noises. I looked basically competent; I could hold a conversation and if I didn't know anything about their specific jobs, I could pick up a cue ('oh, so you want this lab trial to finish before you move abroad') and show I'd understood it.
My DP would have looked either very shy, or totally unable to understand the conversation. She was the most qualified of all of us there.