a slur is determined by how the term was used over time i refer often to the term paki when referring to someone from pakistan as a great example to refer to a scottish person as a scot is acceptable because scots havent been racially profiled and attacked for being scottish in most of the societies we are part of in the developed world pakistanis however have been and that term was largely used against them shortening transexual to tranny would have been perfectly acceptable had the wrong crowd never gotten a hold of the term