What about people who enjoy eating? Cheese, meat, vegetables, wine, etc? Let's not forget eating is a pleasurable activity, not only a source of energy and protein.
I don't get the people who jump straight to dystopian goo foods. There's no shortage of culinary traditions that relied on less meat and are actually food. Have they never seen a black bean taco?
I enjoy eating too, I don't think I would ever switch to meal replacements completely. But I would consider switching my default from my own terrible cooking to a meal replacement and eat out for my other meals.
Learn to cook, read some good cookbooks - for example anything by Madhur Jaffery - it really isn't difficult.
The thought of educated people eating crap like Soylent and paying for it, when they could be eating really good food, which completely uneducated people all over the world manage to cook easily, is quite upsetting to me.
People find drugs and alcohol pleasurable as well, but we find good reasons to regulate them because they have externalities for society that we need to control.
