I have no idea what you're trying to say with your list so .. pretentious? yeah (i.e. your list works on the pretense that anybody has a fucking clue what you're talking about). But I don't think a snob would write either of those posts.
The second one even makes some legit points/criticisms. It's not pretentious or snobby.

First one was describing what bands I got into then got into then got into to navigate over to Avant-garde music. Phrasing it as "real" music as to indicate the mainstream stuff I was into before wasn't as authentic.

Second one was the same reason.

john zorn is my fav

after dj'ing for a while, mostly 60s garage and psych, i got seek of listening to songs

Brian Eno makes it easy to get into experimental music.

Not truly avant-garde... but early Soft Machine really helped me get to a point where I was willing to listen to avant-garde music

Mr. Bungle, Primus and Nuclear Rabbit

then

Frank Zappa

Miles Davis

John Zorn

I guess I came to it via two different routes: mostly the industrial/krautrock route but also the Bungle/Zorn route. I guess I've liked some sort of avant-garde/experimental-ish music for a pretty long time. Going back to my teens I listened to stuff like Pigface, Skinny Puppy, Swans, Foetus, Laibach and Mr. Bungle, which if not always 100% experimental, certainly all have their experimental moments. As I got a little older I started to explore the roots of a lot of those bands and also found myself getting more and more into jazz, which added a lot to me appreciation of the experimental and avant-garde. As time went on I found myself listening to more and more experimental music to the point where now it's one of the primary things I listen to.

El Ten Eleven was what got me into experimental. The drums really set the tone of each song. Also whatever filter they use with their guitars are pretty awesome. They were my gateway to experimental music for sure.

early ones would be The Art of Noise's In Visible Silence (primarily pop but has a few musique concrete pieces) and Orchestral Manoeuvres in the Dark's Dazzle Ships (mostly musique concrete)

got a little deeper in with Aphex Twin's Selected Ambient Works 2 and Future Sound of London's Lifeforms (both ambient "found" sounds)

all came to a head with Captain Beefheart's Trout Mask Replica, I guess