How do I hide reviews on Play Store made by my phone contacts?
Go to People section in Google Play Store:



And unfollow everyone there.

If that doesn't help, go to Settings->Applications. Remove access to Contacts for Google Play Store, clean its Data and Cache, and reboot your device.

If that doesn't help, do the same for Google Play Services.

If that doesn't help, I doubt there is much you can do left. Google Play is not a very customizable application, unfortunately.