All mobs can randomly look at Creative Mode players. Only for a few seconds, and then they  look away.

However, Pillagers just keep staring at you and never look away.

How to test this:

Change gamemode to creative.

Spawn a Pillager

The Pillager keeps staring at the player without ever looking away

Compare that to other mobs such as Creeper, Pig or Villager. They only glance for 1-3 seconds and then look away.

See the screenshots: The pillagers aim straight at me while the creepers couldn't care less