Let's get something straight - there is nothing new in the fitness world. Every 'new' trend is an old method or several combined together and sold as the next best thing. Everything you do in the gym is as old as the gym itself.
People love trends and people love to feel part of something. People want to be part of a group - 'us vs them' so when a 'new' training trend appears (for example kettlebell training) people become obsessed and jump on the bandwagon, they become cult like followers disregarding all other methods of training and preaching their newfound 'wisdom' as the be all and end all.
Fact is, this mindset only limits you. Every training style and method has merit. All the methods developed since the dawn of fitness are simply tools in your toolbox to help you achieve your goals. Blindly adhering to one way of doing things because it makes you feel superior or like you have the 'secret' is just plain dumb.
Don't be a cult follower. Don't be a 'functional' guy who bashes bodybuilders for just pumping muscles - fact is they could teach you how to build some muscle and dial in a diet. Don't be a bodybuilder who bashes crossfitters because they do 'random' movements all together - they could teach you how to push yourself in a new way and to get in great shape. Don't be a crossfitter who bashes powerlifters because they may not be in great shape - they could teach you how to get brutally strong. Don't be a powerlifter who bashes yoga practioners because they aren't lifting big weights - they could teach you how to become more mobile and fix all those nagging injuries.
Open your mind. We have more information at our fingertips than ever before. Use it. All of it!