Does your friends laugh when you ask a question in the classroom? 

Yes,
Its happen when a student ask a doubt to the teacher in class suddenly
his friends starts to laugh without any reason. Its really surprise that
when asked to them why you laugh they don’t have any answer of its but
they do it as a reaction of the question without knowing, understanding
the depth or importance of the question. Same could be happen when
student reply answer of the teacher’s question. What are the facts,
reason behind of this response of the class in general.
 
Its
a human nature, that he/she thinks that they know everything and it
reflects unconsciously at that time immediately, one thing that I
observed. Second point, it might be some people don’t expect the way the
tone in which you replied the answer or ask the question to teacher.
Third, it might be new idea for them and their mind is not ready to
accept this response. Fourth, you are very curious and always remain in
the search of the truth, to know the reality and ask frequently the
questions to be satisfied from your teacher, mentor and to your seniors.
This image or your reflection might be a reason of its. 
 

But, what is the result ultimately of these facts and reason, that is
only one of the best which I understood ” YOU ARE LEARNING”. You are
CURIOUS. You have a potential to understand the subject or complex
things. One day your friends will realize it. So let them enjoy the
knowledge, vision and your own way.

BUT DON’T STOP TO ASK THE QUESTIONS IN CLASSROOM WHEN YOU GET THE OPPORTUNITY.