This dude seems like he was read, he knew what to do. If I was in your shoes, I would find another way to get my BTC to actually paypal or real money. I would never go to someone that is trading currency, of course he has played with those chargeback things again. I personally believe your mistake was choosing someone that had better knowledge than you did. How about changing your currency in a way with someone that doesnt even know what a chargeback is? You just got outsmarted there.
So, regarding your question, I think I answered it already IMO, you shouldnt be paranoid, you should just be making sure in your own ways that the guy you are trading with doesnt have more knowledge than you do.