My company is making an online search engine for teaching resources. The site indexes resources from various educational sites (TES, BBC, etc) and displays them in a post-list format. The site will primarily be used by teachers, who are short on time and not necessarily technically minded.

Example resource:
[![enter image description here][1]][1]

We want to give users a way to rate the resources. I have opted for a like/dislike system rather than star-ratings for reasons such as [this][2] and [this][3]. Users have to login to vote, and can only vote on a resource once, to prevent (or at least reduce) spamming.

One of my colleagues believes we shouldn't have a dislike button. He believes it would create a "*negative feel*" on the site, and source websites "*would not be happy with their resources being disliked*".

I disagree, because I believe our site fulfills the criteria in [this answer][4]. What do you guys think? Can I get further opinions/sources on whether a dislike button is suitable?

**EDIT:**

I'm ideally looking for articles/studies that support my point that the term "**dislike**" is suitable here.


  [1]: https://i.sstatic.net/KKpV4.png
  [2]: https://techcrunch.com/2009/09/22/youtube-comes-to-a-5-star-realization-its-ratings-are-useless/
  [3]: http://ux.stackexchange.com/questions/4200/rate-vs-like-dislike
  [4]: http://ux.stackexchange.com/questions/12625/why-is-the-dislike-button-going-into-extinction