I think we've lost something in translation here. Just FYI, "fuck me" in this context isn't necessarily directed towards you, nor is it "slander".
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Rude or not, Bob was giving you feedback on your prices. And this is a common example of the kind of feedback you're going to get here. You can make use of it, or you can ignore it and move on, but if you get upset about it, more members will come to your thread
just to push your buttons. Welcome to the internet.
I hope this helps. Good luck with your business, and with your English.