Is digital contamination that big of a deal?

no cell phone's much bigger deal.
it's not advised to carry it in the pants pocket. it may jeopardize genitalia performance quality. try to wear it on necklace or chest pocket if you have.

No..The air we breathe, the water we drink and the food contaimination is much bigger deal. Just enjoy what's coming at you.

Digital gear can generate a lot of RF noise that can have negative effects on other nearby gear. Its gotten much better in recent years but still something to be aware of. Really good sound is all about minimizing noise and distortion.