That's gotta be another hardship new guilds have to face, which I hadn't thought of until now. Most of the nicer people are either already long gone or are in existing guilds. So you get the types of chuckle****s you describe rather than real people. Your guild is likely better off without those though. There's nothing to do about that but carry on, eventually you'll get lucky and find good members.
Pug raiding, as a general rule, is a fool's errand. I did a whole lot of it back in the day and seen all you describe and more (though I enjoy a good schadenfreude so I still had my amusement). That's why I recommended you forget about raiding and focus on making a nice atmosphere in guild. If you really really want to raid without at least 20 members (anything less and you risk suffering from shitty randoms), you should ally with another guild. Leading pug raids is just not worth the bother of dealing with the detritus.
There's also the fact that raiding is almost totally superfluous, especially now that world bosses are a thing. Random 80 gear is more than enough to get you started in Khitai normals and Khitai blues are good enough to do Khitai godslayers and Khitai pinks are enough get started on T4, T4 gear is completely unnecessary for anything and is, in fact, overpowered crap that ruined everything forever.
Of course, doing the progression properly requires one to be a human being who wants to play a game for entertainment, instead of some freak of evolution magpie that somehow grew opposable thumbs.
So, next time some chuckle**** asks if you raid T4, you can tell him no because there's no reason to, except being a lootwhore, in which case you should go play Diablo you dumb donkey.