Do read the comments for discussion, I just summarize a bit.
For the con-reusable-bags: As I said, bacteria are everywhere and reusable bags are certainly not exclusive habitats. And reusable bags or not, washing whatever that you will cook/eat is usually wiser.
For the pro-reusable-bags (who argue that, as the article suggest, washing the bag will consume valuable water and release detergent to the environment): Just don't put a single bag in your washing machine and turn it on. That would be stupid. Just wash the bag with your other laundry and you'll be fine. The birds will sing. The sun will smile. Oh I know I'm exaggerating.
And what did I do, exactly? Forwarded it to the BaGoes creator, of course :D