i mean if you are an adult then most of us are not against anything you're doing with your body.  but if you are asking if we would percieve such person as the opposite sex after the "sex change" then it depends on what do you mean by "working sex change"  if you would succesfully change genes in order to change xy into xx, if such person would have working genitalia and be able to reproduce  as well as phenotypic characteristics would align with "new sex"  then sure.
Poland