just rejected a counter asking early deposit

I justed rejected a counter that asks earnest deposit after seller sign the short sale contract. I normally do it after bank approval the short sale. I saw some listing agent start ask this early deposit for short sale. Another short sale had asked the same deposit, I rejected it. They accepted. This new offer list agent threatened to drop the offer (seller already signed and status already changed to contigency) if I don't put early deposit. I told them - Never think about it. Take it or not.
I recommend everybody shall do the same to avoid any potential trouble with the early deposit.