If you have one of those weird phobias like paranoia or persecution phobia you should go to a doctor
Code: sync=intl That will make Yappari only load the numbers in international format from your address book and sync those. Also numbers must have a plus sign and only digits, no spaces, no dashes, no parenthesis, etc.
sync=intl
Even though there are some people here that will claim contacts synchronization is a privacy issue, it is not.
(they could link them to you by your IP address but I'm sure they don't do it).
Also you'll be amazed that +95% of your contact list uses Whatsapp.
People who doesn't agree with Whatsapp principles and STILL want to use it DO have problems. Make your stand and stop using Whatsapp at once!