I hit my Achilles' heel on a shelf.
You should congratulate a person who speaks lots of different dialects because they have to be a really strong person to be able to do it. You think learning Japanese is hard now, just wait till you hear Osaka-ben and Hokkaido-ben. It takes a really strong person to learn all those dialects, so congratulate them and tell them how strong they are!
Fun Fact: 弁慶 is the name of an actual historical figure who was really strong. They were so strong, that we now use their name to refer to all strong people. Think of it like calling someone Hercules or Achilles in Western languages.
This is a jukugo word that uses the on'yomi readings of the kanji. You should be able to read this on your own.