Well, if it is constructive criticism, you should take your time and listen to the one who's talking to you. That guy can give you some useful advice and tips on what you can improve on your blog or whatever else he considers that it is useful for you. If it's just some negative feedback, from a guy who may not have any idea about what he's talking about, then you should tell him to back off, as he shouldn't waste your time with stupid opinions..you don't have to kick his -ss, though. You can solve this kind of problems without having to piss each others off
