The phrasing has elements of elitism, but zooming out I don't think the idea itself is inherently elitist.
One of the issues with reddit's redesign is that they made it more 'friendly' by introducing more media inline. If you have a site that allows for discussion of any topic like reddit, but optimizes for gigantic pictures and animations and by default your feed is filled with content that is more suited for that (eg, things like cat pictures), then you're absolutely going to attract a different audience than a utilitarian pure text site. People who just want to scroll through a feed of cat pictures are going to spend their time on a site optimized for it.
Of course, there is overlap in interests and you'll find a lot of people who'd prefer a utilitarian site to also occasionally like scrolling through cat pictures, but it seems clear to me that the shape of the ui will cause a divergence and overall different culture on a given site. A better example for this than reddit is probably imgur -- you're almost certainly not going there for intellectual discussion, right?
I think the contention here is the word friendly being a proxy for less information density and for a larger number of images / video.
If friendly UI attracts everyone but the other attracts specific type of people, then you will have different concentration of user types. It's a bit like casual games Vs games which are hard to master - completely different types of users.
McDonalds is friendly, their workers all smile at you and wish you a happy day, may even give you three sauce packets for free. Their adverts are cheerful and positive, full of platitudes about how great everything is and how they contribute to your community... But can you honestly say McDonalds appeals to everybody?
Some people would rather eat at an expensive restaurant where the host with a fake french accent turns away underdressed plebs.
That's a weird sort of elitism. Friendly UIs attract everyone, isn't that what a friendly UI means?