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:

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 and this. 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. 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.

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:

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 and this. 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. 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.

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:

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 and this. 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. What do you guys think? Can I get further opinions/sources on whether a dislike button is suitable?

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:

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 and this. 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. 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.