Please make kind offers!! Low offer=no counter

Someone offered me $6 for a $30 item....not only is that ridiculous for something in new condition, but it’s plain rude. Poshmark is how I make part of my income. My family depends on me selling things!! And with the amount Poshmark takes out for each sale, I can’t sell anything for less than $10-$20. Please do not make ridiculously low offers on items that are in good condition. It will only make me want to decline and not counteroffer. Please know that I’m trying to be nice.