In some respects, yes. In the respect they are talking about in this comment, not so much.

The point of their comment is that even if you’re born with something in common with another person, say both of you are born left handed, what else can we infer about both of those left handers? Nothing, nothing at all. Sure they may have other things in common, they may both like the same music, but that isn’t due to their left handedness.

In some ways you can infer a few things about a group, for the book club example, you know they like books and that’s it, if it’s a science fiction book club then you can also infer they like science fiction, but can you tell me the race, age, sexuality, gender, food preferences, music preferences, TV preferences, medical history, yadda yadda, anything else about all the members of that book club? No, you can’t. Because (and this was the point of their comment) book clubs and those in them (and all other groups that aren’t used for examples here too) are not a monolith incapable of individual thought.