Case
Noises

A student makes an awful groan noise when he is told what to do next in class. This would not normally bother me except for the fact that after a couple of months the whole class is not groaning when I tell them what they are to do next.

Solution #1
I would probably start by ignoring the groans to attempt to put the behavior on extinction. I would also begin to praise the students who are not groaning and stress how pleased you are that they are approaching something so positively (exaggerate if you must). Another thing to consider is actually asking the students as to why they react in the way that they do and setting up a reward system for enthusiastic students.

I really like how you address the situation in a positive outlook by providing positive feedback towards students who do not participate in the behavior.

I really like your solution.

Solution #2
Making noises is a type of behavior that should never be tolerated. Just because it is not bothering the rest of the class does not mean it is ok, especially if it is a groan that is following directions. The teacher needs to address it right away, and make sure that the student knows that the behavior will not be tolerated. If needed, the teacher can incorporate a token economy system, rewarding students who are following directions and showing the appropriate behaviors. This can help the student, and hopefully he/she will stop the noises.
Solution #3
It may sound like an odd solution, but I would beat them to the punch with it. I would instruct the students on what the next activity is going to be and then say "All right everyone. Ready? And... *groan*." The results will likely be one of two things. Either it will become an inside joke for the class and they will enjoy it every time, or they will stop doing it because they believe that it does not actually bother you (which they are likely trying to do in the first place). Either way, I would try not to let it bother you, because there does not seem to be much else you can do about it.

I do not agree with this solution. Students need to know right from wrong and by you doing the exact same action as you are trying to prevent is not setting a good example.

Solution #4
I would ask the student how they would feel if every time he or she asks me for help or a question, I'm going to groan. I would also let the know that making a noise like that is very disrespectful, and if continues their will be a consequence.

I like the idea talking to the child about it, depending on the age though I do not know if they would be able to put themselves in your shoes.

I agree, let the students know that it is disrespectful and will not be tolerated.

Being opened and honest with the student about the noise is just respecting the child. I would inform them that it is distracting and not appropriate in class.

Solution #5
If the groaning starts to become a problem, then explain to the students that they are breaking the classroom rules by disrupting the class. Enforce the proper consequences to ensure that it doesn't happen again.
Solution #6
I would tell the child to stop and if he doesn't take disciplinary action. It might sound harsh, but you are the adult here and it seems like they are trying to overpower you.
Solution #7
The teacher should talk to the students about the groaning and explain that it is disrespectful.
Solution #8
It is likely that the student(s) see that you are reacting to the noise and are continuing them to get this reaction. It is possible if you ignored them they would stop the behavior eventually.
Solution #9
In this situation, I would respectfully remind the class of the expectations you set at the beginning of the school year, and follow any important steps of the discipline method. Hold a conversation with the student individually, and do not reward the behavior.