Well, no one wants to educate the ignorant/oblivious. Sure, no one should had to educate someone who offended them, and one should educate oneself. That would happen in a world that approaches perfection better than ours.
However? Discussions are getting inane and insane (this last word, by the way, is also offensive in some circles) because of this principle.
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"[Use of a bad word in an ignorant but innocent context]"
"Did you seriously say that? You [insult]"
"Wait, what? What did I say?"
"You used [bad word]! It's bad! That's terrible!"
"Really? I'm sorry, I had no idea, it's always been used in a neutral way where I live! How is it bad? Where does it come from?"
"We're not here to educate you! Educate yourself! You [something]-centrist [insult]!"
"Why are you mad at me?"
"You're using the tone argument now? [Link to Derailing for Dummies]"
"Could you please not use [something]-ist insults at me at least?"
"[something]-ism doesn't exist, you idiot!"
"I'm sorry you were offended... by the way, if you're insulting someone just because they are [something they did not choose], that's technically -ist..."
"No, you're just sorry you got caught and that we dared being offended at the obvious insults you threw at us. By the way, you're now banned because you're too thick to understand anything! Goodbye, [insult]!"
In short, no one actually learns anything, and everyone pats each others on the back for driving away decent people who made the mistake of not knowing everything there is to know.
What you're describing here is the same, only without the aggressiveness. Hardly better.