Jb2K - Based on your logic the seller is also worse off because they missed a chance to have a successful negotiation because his feelings got in the way.
The approach is insulting only if you take it so. If you assume that the person has no skill at negotiation to use such an insulting approach and put your feelings aside it puts you in a position to convince them your price is fair.
Convincing people that your offer or asking price is acceptable despite any etiquette or personality defects they may have how to get the price you want on either side of the equation. Do you care if you sell to a jerk if he pays your price?
The approach is insulting only if you take it so. If you assume that the person has no skill at negotiation to use such an insulting approach and put your feelings aside it puts you in a position to convince them your price is fair.
Convincing people that your offer or asking price is acceptable despite any etiquette or personality defects they may have how to get the price you want on either side of the equation. Do you care if you sell to a jerk if he pays your price?