What does "taking a class at the Yarn Barn" mean in the following context?
Solution 1:
The Yarn Barn is either a real or fictional reference to a location where yarn and related accessories are sold, and knitting, crochet, etc, are taught:
These activities are something grandmothers and hipster girls do:
And so, by extension, something a tough-guy macho gangster would be mortified about if his compatriots caught him participating in.
Unless he wanted some really cool bling: