Chill guys. You are wasting your nerves on something that isn't wort it. This is an MMORPG where you are playing in a world with other people. Some of those people you'll get along with and with some you won't. Try to stick with the first kind as much as you can.
For me personally its is okay to go into LFR without being fully enchanted and gemmed because at the end, the dungeon does not require it. It was designed to allow for bad playing, suboptimal gearing and talent choice. But I think it is just disrespectful to not take your 15 minutes of time to read a guide on your spec and a basic break down of encounters in the upcoming instance. At least whisper one of your colleagues if you have no clue what's going to happen in the next fight. You are spending the next half an hour of your life with a group of people and I think they deserve that amount of respect.
We are a community with an incredibly diverse player base.
As long as you are not hindering other people having fun, you should be allowed to play the game the way you want. But always keep in mind that you are interacting with real people. Don't throw away your manners just because there is a screen and a keyboard in between.
If someone is calling you names you can either initiate a vote kick or just ignore them. Don't join the down words spiral of rent. We are all part of this community. Everybody has the possibility to make it a better one by just being tolerant and respectful.
Have a great day