They assert it applies even if you are suing facebook for infringing on your hardware / biotech / business model patent. In my non-lawyer understanding the exis

They assert it applies even if you are suing facebook for infringing on your hardware / biotech / business model patent. In my non-lawyer understanding the existence of the patent grant changes nothing in those circumstances (that is they could sue you without it as well with the same merit) and actually prevents them from suing without you suing them first, however companies do not usually restrict themselves like that and consider it a defensive move so someone who is a lawyer should explain what they are trying to pull here.