AIBU to be really pissed off with staff ringing in sick because they have the flu, only to return to work a couple of days later after experiencing a cold.
I would estimate that 90% of people who say the have the flu, actually just have a fucking cold. I am feeling very irate today, and my colleague is grinding on me, telling everyone she speaks to on the phone that she has flu. Absolutely no ill symptoms other than a blocked nose.