More than that though, on electric gutiars, flat wound strings make pretty much no noise, because they're completely smooth. So older, worn in strings will buzz less, and make less string noise. A brand new set of bronze strings on an acoustic will practically sizzle if you breathe on the guitar! Some people like this, others not: it's personal preference. If you still find yourself making more string noise than you like, you may also want to look at the equipment you're using: on both electric and acoustic guitars, new strings make far more string noise than worn in ones. You may want to try practicing some styles with closed chords that require extensive muting, as this will help train your left hand to make cleaner, clearer chord transitions, something like this for example is usually a good exercise for muting, but also might help you to reduce string noise by training your left hand. Obviously you would never play like this, but if it's significantly quieter, then that's an indication you are squeezing far too hard in between chord changes. If this transition is less well defined, you may be dragging your hands across the strings with far more force than necessary: compare for example how much noise you make on the cocaine riff if you take the thumb off the back of the neck in between the change. This should still be a fluid motion not a jerky one, but it should happen quickly.

There should be an almost instantaneous switch between fretting and not fretting a chord, when you stop playing a chord your hand should relax instantly and your finger only be gently touching the strings.

Having said that, I can make a few guesses: a likely cause is that you are not relaxing your hand quickly enough between chord changes. Does the string noise reduce when you slow down your technique? Or when you play certain progressions as opposed to others? If so, what is changing in your technique to cause that string noise. Slow down your motions, and pay attention to what you are doing when you make the noise, and experiment, noticing how small alterations to your technique affect your sound. It's difficult to comment on your individual technique without seeing it, so the most important thing is that you practice, and play very close attention to your sound while doing so.

Stop acoustic guitar feedback