I'm not surprised that one of the club members offered you some advice. That is how it all works. When you belong to the club, advice is freely given to help prevent accidents. If you open a paraglider and start to practice groundhandling in a zone of likely lift ie. other paragliders in the air, you might be likely to take off. The guy with the words of advice was most likely acting in your interest, firstly, and theirs, secondly, if you had taken off and didn't know what to do. You might've collided with one of them for example.
There may be some assumptions made in the above paragraph, but I'm just trying to demonstrate why pilots at soaring sites tend to be seen as being arsey. They have few good sites and work very hard, each year, negotiating to keep them. They still loose the odd one, or have new restrictions enforced, and very often because of visiting pilots or none club activity.
It's good advice to seek an instructor and do some hill flying. Lots to gain and nothing to loose. The very good news is, that if you decide to go PPG only, you will have the scope to reach great heights and places and practice thermalling in abundance, which will leave the free flyers envious of you.
Good luck with your flying Rob. You'll get there soon. And I hope my essay has helped one and all to explain why there might seem to be some attitudes buzzing around. Simples......fear and jealousy
Dave