Thank your lucky stars
Do you occasionally have to explain to a client why the site you made for them using CSS looks different for people who use very old browsing software? You should thank your lucky stars.
It could be a lot worse.
If you made sites using Flash, pretty soon you’d be explaining to a client why the site you made for them doesn’t work at all for people who use the very latest browsing software on the very latest browsing devices.
And you thought progressive enhancement was a tough sell?