Ultimately, people can eat as 'healthily' as you like, but if their healthy, nutritious foods still contain more calories than they expend, they're not going to lose weight. So if weight loss is the goal - which it probably is for someone who is looking at calorie contents of their foods - the rice cakes are a perfectly good choice. If someone is overweight, they need to reduce their calorie intake. Someone can eat nothing but nutritious, non-processed meals cooked from scratch all day long but if they're eating too much of it and are obese, they are no more healthy than a slim, active person who eats low-cal rice cakes.
You say 'just have some yogurt and honey' but yogurt is typically high in saturated fat and honey is no more healthy than any other sugar is. And it will contain more calories than 90 cal rice cakes. The rice cakes, from your description, will also contain whole grains and fibre, which a yogurt will not. So, if someone is trying to lose weight or (eg) reduce their cholesterol, yogurt and honey isn't necessarily not a better choice. Yogurt isn't 'unhealthy' but neither are rice cakes. There are pros and cons to both of them.
90 cal rice cakes with 10g sugar are still healthier than your suggestion of 'just eat a chocolate bar' which will have more calories, more saturated fat, more sugar and zero fibre.
Fruit, eg an apple, would be around the same calories as the rice cakes but still contains sugar and isn't any more filling than rice cakes.
People can make their own food choices. If you don't want to eat the rice cakes, don't eat them. Ranting about other people eating them and assuming that everyone's health goals / needs / dietary requirements are the same as yours are. They're not.
Diet evangelism is tedious. Your way is ONE way. It's not the only way. Focus on your own food and stop flapping about other people's. You're projecting.