I'm surely not the post police, but the post was quite abrasive imo. If your goal is to encourage more care before posting dups, I don't think you got there. it seems though that your post was to try to make someone feel stupid, as if you yourself could never make such an error.
Maybe you believe by ridiculing people they're more likely to listen to you.
Sorry, Labyrinthos... it's been a tough day for me. I get mad too when it seems people are careless. I'm just a bit sensative today... apologies...