What's wrong with this picture?

I had my weekly nutrition meeting last night. The topic of conversation was reading nutrition labels, and we touched briefly on fats.

At the end of class, I asked him a question, based on something he's said to me before. "watch your sugar intake". Okay, what exactly would be a decent sugar intake? We talked back and forth about the subject, because he wanted to give me a "meal limit" and I wanted a "daily intake amount", and he was trying to say that it was better if the amount was split over all of my meals. I asked him "In my dinner of chicken, rice, and green beans, or asparagus, or broccoli, or peas, where exactly am I getting sugar?" Okay, he conceded, there is no sugar in my dinner. So, he agreed to give me a daily number of about 65 grams.

Since I'm mainly getting my sugars from my smoothies, from the fruit in my smoothies, I'll have to do some number checking to make sure all is well in that regard. However, something he said really rubbed me the wrong way.

He was asking me what I typically put in my smoothies. "strawberries, blueberries, half a banana, yogurt, almond or coconut milk, protein powder".

he said "instead of half a banana, because it has a high glycemic index, use sugar-free banana pudding instead".

What? Instead of a whole food, with no ingredients list, that occurs in nature, he wants me to use a chemical-laden, excessively over-proccessed powdered boxed treat? What is wrong with this picture?

I immediately declined, saying I don't put fake sugars in my body. He continued to talk to me for several minutes afterwards, really trying to convince me that a banana in my smoothie is not a good idea. (its half a banana. and Jon and I split the smoothie. so my 1/4 of a banana is way over the line.)

I'm starting to think this is not the place for me.