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Hi @pierrecce,
What I would recommend doing is creating a custom property for that using a dropdown. This will allow you to filter your contacts based on that property as well as run reports.
Let me know if you’d like some assistance setting that up. Happy to help. You can put time right on my calendar here: https://app.hubspot.com/meetings/joshc15
Josh
We have the same issue and have created a custom property for this and then use filters so we dont see them as Customers.
*Josh beat me to it by 44 secs 
@LeeHouse. Nothing wrong with 2 people making the same recommendation.
Thank you Josh & LeeHouse !
Have you a tutorial for this recommendation ?
Regards,