PE Blinds owner swear at me for getting a 2nd quote

I asked them to quote for me, my 2-bathroom windows (identical windows). 1 was more expensive than the other, I asked him to come and measure again, he came but would not change his price, then asked me why did I waist his time. Now his father phoned me and swore at me, really is that how you chase clients away? By the way another company quoted for the same blinds same color same sized same material at 68% cheaper. You have lost a client that have used you before.