Anybody who has been diving for a decade or two has probably been through their arrogant and cynical stages. I have, and I'm not proud of it.
Though he wasn't aware of it, a good friend and dive buddy of mine from years ago actually became hostile to new divers or divers who "didn't take it as seriously as they should." It seemed to him that they "cheapened" the activity. He eventually became no fun, and I avoided diving with him though we remained good friends.
We discussed it often, and what was actually happening was that the edge he needed so much to feel like a man had dulled with experience. It wasn't about the beauty, feeling or comradre with him - it was about proving he was man enough to himself, and if grandma and grandpa were able to dive alongside him, he was sickened. Even the most cynical interpretation of the statistics will bear out that it's a very safe activity.
Jaded divers may be dealing with issues like these. I can see it on rec.scuba, and I think that all the PADI bashing is partly about resentment to the access they provide and encourage. "Everybody in the pool!" is heard as an insult to the over-ego'd diver.
I admit that I'm a bit jaded when it comes to diving with new divers - I just don't want to take the risk... I've payed for a dive and had it it ruined once too often. I admit that I've actually "shunned" obviously new divers to avoid having to decline buddying with them - I am not proud of this, as I say. Perhaps this is an issue.
And, I'll bet that in my exuberant days I was pretty hard to take. If you are one of those talkative types - like me - you may be overdoing the enthusiasm a bit and making others uncomfortable. I, for one, don't like anybody now to interrupt my pre-dive mental check list. Interrupted and asked to help a very talkative dive-neighbor once, I actually forgot my gloves, to turn my tank on, and where the DM had said the reef was!
When meeting divers for the first time I try to talk about anything BUT diving, and have found that people are people and will pretty much relax and open up given the chance.
It's a tense activity for many, whether because they don't dive much, they're doing their pre-dive mental checklist, or because they're there FOR the tense feeling. Bringing the engergy down a little makes any but the die-hard "extreme sport" diver more comfortable and easier to get along with.