when you say hi to somebody, usually people wll reply you [hi] or [what's up]. However, if that person reply you as [hi yourselves] means [hi 你 自己 o拉], which is something very rude. Moreover, you can notice this person's Enlish skill is not very good because this is [Cantonese English]. I never heard a person, who will say that. I think he just make it up by himself.
I agree with chiyinghihi, but allow me to elaberate. Assumed that you take the initiative to say "hi" to somebody, you would usually say "Hi, how are u?" (s)he will answer "Good, thank you" or "Not Bad" just to be polite, but sometimes you might hear someone answers like, "Not bad. Yourself?" It actually means that "I'm felling alright, how about you?" But no one would say "Hi yourself", or "Hi, yourself". It's just wrong, regardless it's written English or spoken English.