I use K+ Neem Insecticide - Fungicide from Organica and I'm certain it's harmful to bees if they're out and about when this product is used. Perhaps there's different mixes of neem in a variety of products. The label on K+Neem states: "Protect pollinating insects: unless flowers are the target of pest species, avoid spray treatments when plants are in full bloom." And "Bee Hazard: This product is toxic to bees exposed to direct treatment. Do not apply this product while bees are actively visiting the treatment area."
I would urge uses of any product(s) containing neem oil to read packaging labels and heed warnings about using this product when pollinators are active.