If you hang out with certain people you act like them so yeah monitoring friends is important but you also need to teach your child that they going to face evil in this world and how to deal with it and how to say that's not for me. Peer pressure isn't just some thing kids deal with but adults as well.
Indeed there's some truth to this, in my humble opinion and personal experience in my life. I found and learned with the people you hang out with you tend to become like and often sometimes start acting like.
There is God's wisdom that teaches us these things . I even found in dating that I would become like and pick up things from the person I was dating . It's not to keep myself in a bubble , but rather I think to be growing closer to the Lord and growing in his likeness , by hanging out with others who have the same common goal . There's a lot to be said about that . I am still a big witness to my community, to those who are not and as long as I keep myself in his word, I am not shaken by that . I like to think I'm strong in my faith and belief in my Lord, I still believe Satan is out to steal, kill and destroy God's children and anyway he can and to lie to you it doesn't matter about who you hang out with.
Indeed some of the Pure Flix movies are quite good!
