Friends don't let friends put Pyrex in the dishwasher

When I give Pyrex as a gift I probably sound like a crazy woman as I beg the recipient to NEVER put it in the dishwasher.
This is Pyrex.

This is Pyrex that has been through the dishwasher one too many times.  These used to be bright, shiny yellow dots.  Now they are just yellowish matte dots. My heart breaks when I see less common pieces of Pyrex that have been abused.

End of rant.