I would rather not confirm or deny, but I find it funny that apparently telco companies in the US share a considerable amount of hate; enough for you to have to wonder :D

maybe it is a location-based hatred distribution?

I've hated every Telco I've ever used, except the first. The first was a small local cell provider that kept my prepaid cell phone in service for months after my funds expired. Since then I've been plagued with terrible service (customer and signal), random outages, near fraudulent billing practices, sketchy offers, high pressure sales in stores, overage fees, arbitrary fees, continuously increasing bills, etc.

Could easily be Telekom, which is T-Mobile in Europe. But yeah, it's one of those.

It's not American though.

Indeed, but it bought Sprint last April, so it's got some American DNA now.