What everyone has said above. The beware is warranted, but your attitude towards the client wasn't professional either. Take this as a lesson learned and perhaps change the way you approach potential business in the future. It's not good to take the 'bait' that people throw at you. When they're being smart-asses, better to leave well enough alone, block them, whatever you need to do, just ignore them. Don't give them reason to target you. If they know what presses your buttons, they see you as easy prey if you publicize how much it irks you.