It’s not that they hate it, ReactJS and jQuery just have different functionality, which is resulted in their execution. Besides ReactJS has more possibilities and is being perfected constantly. That is why every ReactJS developer at our company knows not only React and jQuery, but other technologies as well. Besides it is used by a lot of really famous companies (who would use only some of the best technologies), like Facebook (sure thing), Instagram, Dropbox, CodeCademy, GitHub, Twitter and many more. But here it is really important to follow all updates.