I will have to disagree with you on the younger people thing, though we as younger fans have our share. It has been my experience that age has nothing to do with how you act at a game or on the internet. I have known plenty of older people who get on the internet and are just as annoying and disrespectful as others. That has just been my experience. I think the reason it is a sign of the times is that there are just so many more ways to hear about it now than previous generations.
As far as this thread goes, it is disappointing to read about people's negative interactions with the VT people. My dad and I went to the first Music City bowl when VT beat us badly and the VT fans we interacted with before and after the game were good folks and were very gracious about the win. This was before the start of their recent success, but it still makes me a bit sad to see this. You would think that people who take the time to post on another teams board would want to be friendly, since they took the time to find another teams board, but who knows.
I think the message is not that "age" in and of itself is the reason. But that the "age" points to the era in which they were "parented and raised". It is no secret and dang near a fact that young people today are much more inclined to "get in your face" and show a lack of "manners" or "respect".