OK - I guess I misinterpreted the idea behind 'DA - DT'. I thought it meant, and as you quite rightly say most well-adjusted people would probably agree, that the question of the orientation of others should be of absolutely no interest to anyone else.
After 'Black Monday', 'Pink Wednesday' was merely a way of reminding people that the previous policy had irreversibly changed and was not intended to be in any way derogatory or humiliating. It was a term which others more senior than me adopted at the time.
Commerce refers to the 'grey pound' and the 'pink pound' with respect to the disposable income of particular groups in society in a similar vein. Apologies if it caused offence.