There was a time when people didn’t touch each other. Gentlemen would shake hands to seal a deal and possibly kiss a woman’s hand on introduction but most acknowledgements was a tip of a hat or a shy nod.
Then handshakes turned into fist smacks and chest bumps and people started getting a lot more physical with each other.
Hugs have now become the norm. You see it on all the television talk shows. Guest have to hug as if they were best friends to the host. You can’t go to a party without hugging a bunch of strangers.
Perhaps it is just I protect my personal space until I physically know the other person and have become more familiar with them than just a hug.