Humor??

1.Sardar: Yaar toothbrush dena mere brush ka ek baal toot gayaDukandar: ek baal toota to naya kyu le rahe hiSardar: Jo toota wo akhri tha 2.Pappu: Yar ye South Indian itne kale kyu hote haiDipu: Wo din raat sun tv surya tv dekhte rehte hai3.How do Bongs learn alphabets?A for Orange, B for Bhegetable 4. How do chinks name their kids?They throw silver ware down the stairs5.A man inserted an ad in the classifieds, "Wife wanted". Next day he received a hundred letters all saying the same thing "You can have mine" 
Well all of it is for a good laugh, I just wonder what is tolerable and what is not. Again, I have no answer just a few unrelated questions. Why is it that all humor is at the expense of "others"? Can there be humor which is genuinely not offensive? "It is all in good humor", they say but who decides what is acceptable what is not? In the world one colored people are laughing at the other, one gendered people are laughing at the other, one religion is laughing at the other, one nation is laughing at the the other, in a country like India one region is laughing at the other or probably one state is laughing at the other. Continuing this line of thought I end up at this juncture where I'm compelled to think if laughter is actually as pure as it is portrayed to be. If each one us is laughing at the other on some characteristic, would it be wrong to say that the pleasure from humor is actually a pleasure of contempt, pleasure of feeling superior over the other. "But humor is not so dark, it lightens the mood", probably so when one is a part of those who are mocking  but definitely not when one is a part of those who are being mocked at. Probably healthy humor is only that which originates from fantastical situations and not reality. Because somehow in a day to day situation it seems to suggest that there has to be some one to be laughed at for humor to exist. Probably it is justified as long as it doesn't hurt. Like they say, probably it is alright if it is in a limit. Which again beings us back to the question, who decides the limits. Probably this is why ability to laugh on oneself is considered to be great. Is that the purest form of humor?Probably I'm unnecessarily de-humorizing humor. Probably the trick is in laughing at one and other, with no discrimination. Probably the answer is in making fun of everyone democratically.