Putting things and humans alike into boxes is easier and helps us take decisions faster. In some situations it is helpful to make a quick jugement like I am in danger or not but when it comes to people is something foolish because humans are so complex, most of the time we cannot understand ourselves.
When you meet someone you instantly associate him with some characteristics, they may be true or not. So do your friends when it comes to you, you are made of your likes and dislikes so they know what to expect when they interact with you. If you change you preference, even once, you exist the pattern therefore, in some sense they no longer know who you are and how to behave.
Quitting the routine and trying new things from time to time makes life more interesting and you should continue to spice things if you enjoy doing it.
Thank you for the wonderful article you wrote, i really did enjoy it.