Awesome gotcha. Adobe makes it you cannot remove their horrible Flash Builder 4 from Eclipse #flash #eclipse
I can remove all other plugins from Eclipse. What the frigging hell Adobe? You have elevated yourself to a new level of turd-om. Congratulations to those horrid engineers. You have been warned. Do not install this horrid software into your Elicpse. You will never be able to go back.
You have been warned!
Of course, I should have thought of removing through Windows Control Panel. Not the usual way of un-installing an Eclipse plugin.