Why? Because some of us get tired of having to interact first and makes us looking annoying just because it, if the person is really your friend you wouldn’t be doing all that shitty stuff. That doesn’t make you look mysterious or whatever you wanna look like but a rude person.
I will say this here because it makes no sense me saying it on my priv; please guys, ignoring your friends and keeping the “mysterious looking person” act in front of them is just bullshit, they feel bad, if you avoid someone who is YOUR FRIEND will make them distance.