One thing I've learnt from this thread is that
there are people here who
I do not intend to make deals with -- ever. Their standard of behaviour
and mine are just too different.
I have no such bias, but I do treat individuals differently based on past
experience. I make a large effort though to keep transactions, business,
and not personal (ie regardless of what happens in the transaction it
should have no effect on personal relationships). Eventually I may even
learn to be polite all the time. ;)