Yep, the coughing and sneezing really are very annoying and worrying indeed. Sadly, more often than not, on flights, there seems to be at least 1 person near me who is coughing or sneezing often. That is actually my biggest pet hate, along with bad odor. Fortunately, I have been lucky with the latter, except on 1 occasion. Having an annoying, troublemaker kind of person sitting next to me is another one, but I have been totally lucky with that. In fact, in the so many long flights I have had, I haven't witnessed even a single fight or even a serious, long argument around me fortunately.