And the majority opinion seems to be ‘fuck those kids that don’t understand how to use lemmy, we don’t need them’.

I see that too. I suspect that will go away with time. Possibly not very much time tbh. You often see that sort of attitude when a community based around new software is very small and new as culturally it is heavily influenced by people either involved in development or who pride themselves on being early adopters. Neither group is usually very good at understanding the significance of the barriers to entry for most people. Right now we're seeing an influx of people who couldn't care in the slightest about poking at new technology, but who are willing to do so because they want to explore a valid alternative to Reddit. That influx will naturally shift the culture and I'm pretty confident that going forward the general vibe will be that accessibility is an important thing (especially as blowing up accessibility for no good reason is at the core of why a lot of the new people are leaving Reddit.)

I disagree that it was harder to sign up for. At least on Lemmy.World (which I'm confident will become the default instance over Lemmy.ml) you just put in a username, email address and password and you're in.

It does have far less content than Reddit. However, it is largely more active users who create and moderate content who are moving over. It'll take time but they will grow the communities into places with a lot to offer new users. By the time that happens, it's likely Reddit will do something to upset and displace their users again and they'll find growing and thriving communities with increasingly compelling content to greet them. (and hopefully, even if Lemmy hasn't become much easier to understand by then, the explanations and the guides and all the other "welcome new person" stuff will be more evolved by then.)