I doubt its a typo. People can be real pricks on here. Worst part of it is, if you were desperate enough to accept his insulting offer, he probably still wouldn't take it. People make empty offers all the time on here.
Learned that the hard way when selling my 335i recently.
Sweet ride, good luck with the sale.
2016 535xi MSport (assume my lease)
1990 M3 (sold)