On the matter of simply reaching out and taking whatever anyone hands you, I encourage you to wise up.
The following magic words need to automatically come from your lips whenever anyone in public or private hands you anything: "What is this?"
Wait for a verbal answer and then you are in a position to make an informed choice.
People who hand you things bank on you automatically reaching out to take it.
If you live in a city, you will have ample opportunities to practise this because shopping malls are full of salespeople "innocently" palming off to you their sales pitches. Learn to ask and then learn to say a firm, "No thank you!"
Smile and walk on, head held high. Never again mindlessley reach out and take what is offered - unless you consciously decide you actually want it.
Power to you!