Older crowds in every recreational activity tend to be snobby, insular and a general killjoy. I don't think it is exclusive to flying. But the point is noted. I also don't think they mean it. I think they have lost perspective to what it's like to be younger and with less resources. Pilots in general are not the friendliest bunch by that virtue.
Hang on -- I spent most of the 90s in the Bicycle Road Racing crowd, dominated by 20-somethings, and if you want "unfriendly," there's no better (I was in my thirties at the time).
BUT -- there's a reasons for that standoff view -- this newbie might take me down hard in a turn, might be here for one race and then gone, or might blow my doors off and make me look bad.
What does this have to do with flying?
Spend some time at a GA airport near the fence or parking lot (I have) and interact with the folks that stop by on a nice evening. Here's the typical sequence:
PILOT: Hi!
GUY BEHIND FENCE: Hi... you fly these..?
P: Yep!
GBF: How much does it cost?
P: Well, that all depends...
GBF: My buddy took me up once -- I puked my guts out...
P: Yeah, that can happen...
GBF: Are they safe?
P: As what?
[and so on]...........................
This exchange goes on for 30 minutes. Now, I got to the airport at 5:30, pulled the airplane out, preflighted, fueled up with $5/gal 100 LL, winds are calm, the sky clear, and the sun is rapidly dropping towards the horizon. A low is sweeping in overnight and the next 5 days promise winds, low ceilings, rain, and general yuckiness. The FBO guy is fueling the next airplane so I'm solo for this restart.
So, I gracefully excuse myself and go through the tie down, start up, untie, and taxi out ritual.
So I've done this a few dozen times in the last five years, have taken various children up to the airplane, let them sit in the cockpit, etc. I usually have business cards and provide them after hearing the third time, "I'd really like to learn to fly someday..."
Do you know how many have called me?
Yeah: 0
So, I'm not a bit surprised that a few folks with a few more years in the game are a bit jaded when new folks are found wandering around the airport. They've had their fill of FAA "Inspectors," local government gold miners (you know -- the airport is a huge source of revenue!), and well-intentioned but unserious types. There's only so many hours free in a week and when we finally get to the airport we want to wring out as much aviation as possible. For some that includes hangar flying.