I think you're totally wrong.
Uniteds away support is mainly families and 50+ along with the odd group of 40+ who have been drinking.
I beg to differ on that one. I've been going away pretty regularly since I was old enough to. Normally in a group of lads, occaisonally just me and a mate (when the bulk of the group wouldn't go), more recently in a group of lads and Linz.
Week in, week out, there are a number of faces who you recognise and talk to. The majority of these do not fit into the groupings you have used. A number of them are 50+, some of them are families yes, but flask and sandwiches? I don't think so.
The stereotyping works both ways, some people think certain groups are a bunch of kids/chavs, some people think the older blades or blades supporting families are there to spoil their fun and don't support.
The best examples I've seen of this in action are a young lad and his older mate, taking the piss out of and abusing one of the most travelled older blades (I'm not going to mention him, but everyone knows him

) who merely asked them to cut out the racist abuse towards Michael Ballack. Absolutely no respect whatsoever for others and had the audacity to assume quite vocally that the bloke in question was one of the quiet killjoys.
United's away support isnt vocal at all - and most would be happy to sit down, stay quiet and enjoy whatever they have in their flask and the sandwiches that they have fetched along and would be happy to sit quietly and watch the game.
United's away support can and has been as vocal as anyone on their day. You are right in saying that it has been quieter in recent years, but having been there every single week, I don't think it is the usually blamed family influence or the less vocal supporters that have necessarily caused it.
One major difference these days is, and I suppose it probably always was a part consideration, the crowd seem to think on the whole that it is the team that should spark them into supporting. If we aren't in front before five minutes in, someone starts shouting "sort it out for f*cks sake", people start groaning, sighing and then booing.
McCabe was right in the Q&A, we used to love football more, we care more now.
In the past, win or lose, we used to have a laugh and get behind the team whatever. Yes it hurt to lose, but we could laugh at ourselves. These days more and more it is a case of either sitting quiet with your head in your hands or screaming and abusing anyone you can think of to blame.
We are a separate group to these people and don't want to support united like these people and want to vocally support united together within the "away support" as you call it.
You are only a separate group if you make yourself a seperate group. We are all blades, all there to support their club in their own ways.
I call it the "away support" because that is what it is. People who regularly travel these shores and beyond following the Blades. Many of whom have spent the majority of their lives shouting themselves horse long before a "seperate group" came along.
It seems as though the first group of people I mentioned do not respect our right to support united how we want and are in fact worse than the people who they give negative reactions to inside the ground and criticise on the internet for wanting to support united vocally.
So anyone over 50 or that goes to the match with family members doesn't respect you and are worse?
There are a number of points within this post itself, that hinder you achieving what you wish to achieve.
You mention people thinking you are lesser, in the same breath as stereotyping anyone in the ground who isn't in your group. Continue to do that, and you will get a negative reaction.