Go to your profile
Click edit under "Technologies"
For likes enter "PHP"
For dislikes enter "Fashioning-rudimentary-stone-tools-from-sticks-and-rocks-held-together-with-sinew Java"
Either save as requested or provide a helpful error message like "People who know how to use the internet generally use short, generic, searchable terms as tags. Looks like you'll be stuck working in the adult diaper manufacturer's customer returns department for a while longer"
Button shows "Saving" forever.
It looks like it does save, so maybe it works the first time, but the response is an error so the DOM update does not change the button back.