I’ve played both factions competitively and casually for over 10 years now and it’s pretty much the same everywhere, with a few realms and groups being more vocal than others.
I’d definitely suggest trying to add people that you think have been friendly and enjoyable to pug with if they are ok with it to have a mini network of players you can group with!
I currently don’t have any characters that are as geared as my alliance side toons but if you’re up for it you can dm this toon in game and I can give you my btag to help out the best I can. I am working on catching up with the horde toons but I also know a lot of friendly and experienced players who are always looking to make new friends and they won’t be rude like that. LFR can be pretty brutal tbh, it is a hit or miss depending on the day.