Someone suggested an edit to remove the ruby tag with the reason:

ruby != RoR

I was tempted to reject the edit, since ruby is a valid tag in my opinion for ruby-on-rails. The user is a good contributor in the ruby tag on SO so I was doubtful what would be the best option here.

Do we reject edit like that or are we separating Ruby and RoR?

Here is a rejected similar edit and here is an accepted one.