This phrase has aggravated me since the first time I heard it. Those who use it justify it as being akin to, “...same thing!” which has never sat right me. In my opinion, something is either the same or it is different. By this token, “Same difference!” sounds like a junk phrase that sounds correct but is, in fact, meaningless. It grates for me as much as “irregardless”.
Am I incorrect? Is there any validity to this phrase, outside of modern colloquialism?