Possibly because the ESFJ guy would try to mimic ESTJ/ESTP guys to "fit in", and ends up with a persona of "shallow, brainless douche."
The one ESFJ guy I knew was a pretty nice guy, generically tried to get along with everyone. Meh.
Edit: not that ESTxs are shallow brainless douches x_x;;
Edit edit: you know you're an ESFJ when you've planned your entire week by 15 minute sections, and feel agitated when you cannot do what the schedule says (seriously, I've seen this and it weirded me out).