Ye be fine. Relax and enjoy the pub. All is forgiven when a pint passes between mates.
But that does remind me of a story. I once had a "Stitch Nazi", as you put it, get in me face about the material I used in an outfit. He was quite uppity that me outfit wasn't "period".
I just smiled me slow patient smile and looked at the white sneakers he was wearin' under his garb and cleared me throat.
He didn't skip a beat. He then attacked me hat.
I just smiled and kept on smiling until he was quite through. Then I went on enjoying myself.