One of my best friend's go-to phrases is "no worries." Which is ironic since he has a type of severe anxiety disorder. Oddly enough, he's one of the most chill people I know though. Anyway, I struggle with anxiety as well, and his laid back personality relaxes me. I get how the phrase would be irritating. Is the whole go with the flow aspect irritating, too? I think, for my anxiety, I've learned to sort of absorb that energy from other people. Indeed, all of my friends are very laid back, very type B.

Btw, I'm also a Gen Xer who works with quite a few Millennials, too