You are a sophomore, they are freshman. I hate to break it to you, but you are a year older than them and that means NOTHING. They are weak and so are you. There is no relativity. Weak is weak. They have no reason to respect you.
They didnt ask for your advice. How would you feel if someone who didnt look much different from you started giving you advice and telling you that you were doing things wrong when you didnt ask them for it? Youd probably come on here bitching and whining about it like you are in this thread.
Hes a skinny, weak, douchebag? Well, right now, so are you. Stop being a douchebag, focus on your own lifting and not on there, and get bigger and stronger. Theres your solution.
Who cares if anyone puts him in his place because he is a douchebag 14 year old? Let him learn his lesson from someone else. If you fly off the handle at him you will 1) look like a bigger douche and 2)probably get in trouble for it.