Do you think it rude or fine to repeat another user's idea when answering a question and then not give that user credit?

I see it occasionally on a few questions; it most frequently appears on questions with boatloads of answers. One jelly, in the first few answers or so of the question, will make a suggestion or post a helpful link. Then, several answers down (or sometimes right under the first jelly) another user will post and repeat that same suggestion or link, without acknowledging the jelly who posted it first.

Aside from the fact of repeating information like a parrot, does this behavior bother you? Why or why not?