People who try (and fail miserably) to justify the cheer haran of Draupadhi are the funniest people I have met because let me tell you why.
Their argument most of the time is that Karna was being humiliated for his caste and because Draupadhi mocked Duryodhana as अंधे का पुत्र अंधा (English : the son of a blind man is also blind)
So first of all, in the more authentic versions of the Mahabharata, there is no mention of Draupadhi mocking Duryodhana. The Pandavas did laugh at Duryodhana, yes (except for Yudhishthira and mayhaps [not sure enough] Sahadeva) but Draupadhi wasn't in the maya sabhā (English : palace of illusions) to begin with.
Now for the part where Karna was mocked for his caste. I won't say that was false because it wasn't. He was indeed called as Suta Putra (yes I know people called you by your caste in those days and it was not a humiliating thing but the way they did it with Karna was meant to be humiliating) but you want to know something? Draupadhi did not call him so, as many people believe she did during the svayamvar ceremony. He simply failed to string that bow (in some versions he even failed to lift it up in the first place)
So, respectfully, Karna might have had his reasons to hate the Pandavas (even if most of them are so very invalid) but Draupadhi wasn't the part of it all. She had NOTHING to do with the mocking please read Mahabharata and not the serials (watch the series' for fun, indeed. but to pronounce it as history is rather odd)
So dearest Karna fans, if you love that man then your choice (even if it's a bad choice) but atleast don't blame the victim in the scenario because your knowledge is limited to the series. And (disrespectfully) your words about Draupadhi show how well developed your brain and personality are, get some help. Or Krishna. I don't know, whatever helps.