First, many people have politely explained why they prefer these parties to clear content. You just don't accept the answers. Simply, (other than those who do use it as a way to insult people) people looking for other like-minded people who have similar experience and expectations.
You're basically saying that what does not benefit you (not being able to be in any party you wish), or people who think like you, doesn't benefit another entire group of people? You expect people to use their time (which you apparently have no regard for, by the way) in the same way you choose to use yours? Your entire post focused on why you think everyone should do what you think they should be doing with their time and their money, especially if it gets you what you want. You, in no way, recognized that there are multiple options for gameplay and that it is always the player's choice to play how and when they like. No one is forcing you to join these parties, just like no one is forcing those people into learning parties.
I see so much complaining about discrimination (bit of a bold word to be used in regard to something you feel is casual) against less experienced players in this thread, when the reality is that the majority of the people going into (or forming) these 'discriminatory' parties also spent the time learning the fights via joining (or forming) learning parties. They put in their time and effort, helping and learning, but are expected to gain no reward (such as ease of doing weekly clears from then on) for doing so because, in your estimation, it doesn't benefit the community (you)? The logic in that is so utterly flawed that it's shocking. Mind you, forming a group gives no one the right to be insulting due to mistakes, but to feel you have the right to tell another person what guidelines to use in forming their own groups in a game they spend their free time playing and their money paying for, following the game's policies, is arrogant beyond reason. Perhaps more arrogant than you accuse them of being.
I will continue to form learning parties for content I am not clearing with my static. Anyone can feel free to join them, with the guidelines being that patience and civility is required. I will also continue to form "2 fail = removal" parties when I am confident in my ability to clear said content, and anyone is welcome to join those, as well, with the guidelines that they will be politely replaced if their mistakes (or connection issues) are holding back the group as a whole. No one is forcing them to join either group, but they just might find that, in either case, the groups go much more smoothly because they are full of people who have the same expectations.
Why does this even need to be explained? It's common sense, and not something that merits complaint (and yes, it is complaint) on the forums. Really, it just comes off as being upset that a group may not have the same expectations you have, and as people who would rather complain about a thing than just form their own groups with guidelines they feel are appropriate.