As a newb, I'd say it depends how you said it. If it was "it works better if you put your foot back against the binding" you weren't being a dick. If you said "put your foot back, dumbass" then you were being a dick. Trying to help others whem you see them doing something wrong isn't being a dick.
well I wouldn't call someone dumbass even if they were my friends. I just feel like the "caring too much" guy when I try to tell someone they are doing wrong.