Well Tsurara, i get the impression that you are asked this quite frequently from the class you are teaching, right? and a simple question could have a hundred meanings to the kids that are asking the questions.
plus I think it is better to tell the truth than to lie to anyone, but I am not saying that it is the best course of action. sometimes it is needed to tell a lie now and then.
as to the questions you have asked us here are my answers.Have you ever been teased for your hobbies?
Have you ever joined in teasing or looking down on others for similar ones?
Are there some people that even you consider "geeks"?
yes I have been teased for my hobbies and it hurts, when they look at you like you are some sort of freak.
NO I think that teasing someone else is uncalled for and it hurts their feelings, as for looking down upon another person, I am ashamed to say yes, I have looked down upon another person.
now this is quite a difficult question to answer as I have been branded with the same contempt as people show towards "geeks", but no I do not see people as geeks because they are just like you and me.