Don't know for sure, it may depend from what is posted in the reviving post, maybe .....
Like ..... if an old thread is revived for post new info about it, or for place a question related to new problems that involve specifically that post, then i see nothing bad .....
If instead an old post is revived for just say "cool" or "sweet" or funny comments, or for post a new question that can be related to the same argument, but not directly with the OP thread, it can be considered "wrong" or at least not correct, in some forums .....
As the same example, just posting funny one-words posts in old threads, can unnerve peoples that have the old threads bumped on as "new ones / unreaded" with arguments that was already discussed and no more info are given ..... instead, for the "netiquette", followed in a lot of forums, is always considered preferable, if you have a question that was discussed in an old post without satisfying replies, to simply open another thread and mention / link the old one, so if someone don't remember it, can go and look .....
Like, as example, "i have this question about this problem, i have found that it was already discussed *here* and *here* (links), but i still need clarification / some different info / new problem / whatever ....."
So, the readers also know that is a new discussion involving an old problem ..... and still see that the OP made "homeworks"

reading and searching, before ask
Then, about the different reactions, it's all matter of personal feelings ..... someone may just decide to ignore the reviving thread, someone may say "hey the post is old, look this new one", some others again may overreact and bash the resurrector, but about this it's all matter of different personal feelings, and i have no ways nor possibilities to explain this
