I wouldn't necessarily say that the capt pointing out to the f/a that she was wrong to make an assumption is unprofessional, but that is conjecture (but it might be pertinent to point out only the three of us where present). Perhaps better placed for the SLF forum, but if I get poor service from an airline why shouldn't I shout about it? If no-one ever complained would anything ever change? Again, moot points, but ones I felt should have been brought up for discussion.
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Remember: all landings are controlled crashes!