So is the rubberized goo stopping you from putting a socket on it or
can you get the socket around it but it is just stuck?

If so, be careful getting happy with extenders or cheater bars:
Make sure you remove the plug with the engine cold. The head being
aluminum and the plug being steel, they expand at different rates which
means that you can actually do damage if you force it with a cheater
bar if the engine is warm.

When reinstalling, put a little anti-seize compound on the threads for
next time.

Remco