I take people at their word and just charge normaly.I view what i do as a business to try not to get upset if people take the pee. I just keep rolling, bad debts etc i take the hit and don't let it screw my life up.
I'm not saying i'm not capable of being petty and small minded, as this thread might suggest you are Stuart, but you have to be able to let go.Whether it's losing an argument on here or letting some 80yr old biddy harangue you out of a fiver.It's no use turning over at three in the morning and thinking let the old bag try again, i'll be ready for her next time.
If you spend your time focusing on petty things, that's what you become.