Since when did craigslist have trolls?

I put an adv. in for a graco safeseat and said it was the only carseat to go to 30lbs.( This was to my knowledge cause that's what Graco claimed.) This woman e-mailed me this smart a** comment that there is another carseat the Chicco keyfit that goes to 30lbs. I e-mailed her back saying I didn't know they gave out Degree's to people for carseat knowledge. She e-mailed back saying they are called Carseat Techs. Has anyone else had this happen? For crying out loud a person can't post an adv. and not get their s chewed for it?