I'd trust food from a food co-op, but that's a whole different issue than the safety of glyphosate treated crops. Glyphosate isn't designed for vegetable crops, to my knowledge.
One of the biggest benefits of food from a co-op as opposed to food from a store, is avoiding food treated with pesticides. Those are designed to kill stuff in the animal kingdom. Much more likely to be harmful to people than herbicides, which are designed to kill stuff in the plant kingdom.
Personally, I don't use either pesticides or herbicides on the stuff I grow because its a good idea to reduce consumption of ALL of those unnatural chemicals. Glyphosate is just one of hundreds of those chemicals that a person might be exposed to, and I doubt it's anywhere close to the worst of them.
Thanks