As someone that had to support IE6 and Chrome at same time, I can't agree with this statement.
For contrast I now support IE8 and IE9. Without jQuery. It's bad. Really, really bad. Like, there isn't indexOf on Array and asking for polyfill is forbidden.
It's great if you never had to deal with them, but that doesn't mean it won't happen.
Note: It wasn't a one-off job either. There were multiple jobs, government sector.
Us programmers often get this wrong.