I would treat a lesbian approaching me in the same manner as I would a heterosexual male that I am not interested in. Neither hold my interest or have anything to offer me in the relationship department that I would like to recieve. A lesbian wouldn't receive a rejection any harsher than that of a heterosexual male. The only reason I would become angry or bless them out would be if I was provoked by their persistence. Anyone that becomes angry or irrate just because they were approached needs to check themselves. That type of behavior is immature and should not be displayed if one is confident about one's own sexuality. If someone approaching you becuse they are interested in pursuing a relationship with you threatens you then you have a problem. Simply tell them you are not interested and move on END OF STORY.