I don’t have a MacBook myself so this is genuine curiosity. My understanding is that it changes context depending on what program you are running and can be customised as well. This sounds pretty cool to me and quite handy. So I’m curious as to why everyone seems to hate it?
Touch Bar is different. It changes things. It breaks your usual ingrained workflow ever since you started interacting with a computer. It changes how you work on and with a computer keyboard since it is an augmentation that is also contextual.
To me, that contextual nature of Touch Bar is its biggest asset as well as the bane. I rarely ever use the top row of keys on my keyboard. However, with Touch Bar, I used to customise apps and that helped me use my keyboard space better since now there were contextual buttons I could use for apps. So, my muscle memory only needed to get accustomed to the placement for a while, and then it had become second nature to me. Personally, for my multidimensional use case involving both productivity and entertainment, Touch Bar made interaction with apps better for me since after a while, I could just press a button on the Touch Bar instead of using my finger to drag the pointer to the intended interaction.
One of the reasons people seem to abhor Touch Bar is that it requires you to look down for a while before your fingers become habituated to the placement of "virtual keys". In today's world where patience is rarer than the rarest mineral on earth, this is a problem, since people do not take well to change and definitely not when that change is so drastic.
Also, I sincerely suspect that save for a section of users whose workflow would be better off with haptic feedback (say, of an Escape key, that now stands resolved), most users only cringed at the Touch Bar since at launch the software was not optimised for it and is still not as optimised as the potential is, coupled with the price. Had these users, in 2016, found that Apple released notebooks with Touch Bar at the same price-point as the 2015 notebooks with no Touch Bar, I do not think a large portion of users who mostly upgrade or buy notebooks just to have the latest and greatest would have been so vocal against the Touch Bar.