Before The Comedy...

"'...nae Sassenach I...'"
-see here.

Sasanaigh a leidhbfinn mar a leidhbfinn seanabhróg
-copied from here

 - meaning:

"I'd throw out the English like I'd throw out an old boot."
-see England.

meet it is I set it down
That one may smile, and smile, and be a villain—
At least I am sure it may be so in Denmark.
-copied from here.

Although English humor is appreciated, "meet it is I set it down" (to quote Hamlet) that the British Isles have a history of conflict.

"...one may smile, and smile..."

(I found the Shakespeare quote more appropriate than I had expected.)

(I now cannot find the link for "Sasanaigh a leidhbfinn..." but I have quoted it correctly.)