Yeah pretty rare on Swiss. Nearly 100 long haul flights with LX (50/50 J/F) and I've never had a bad experience. I've had maybe 2-3 flights in F that the crew where indiferent. Did their job but didn't really care. Never had a grumpy FA though.

I get that you can have a bad day, but to take it out on passengers is not very professional. Just like I don't take out my mood swings on FAs...