to buy? not to buy? the Speedy 40?...BUT !@#$%

OMG! I've had experiences like that sometimes. Usually this are these old 'wannabe' ladies that really think they're too good to serve you (just jealous IMO since they work there and you just buy something) I really lost my intention on buying then...
But if you really want the bag, either ASK for another SA (let them know you do not want to be served this way) or buy it and let her know she still there to sell YOU something and that you don't like to get the feeling you should beg them to take your money.... (I'll def. go and do that if it happens to me another time!)