I hear it quite a lot, especially from colleagues. "I shouldn't have come in today, I've got the flu", or "I can't stop sneezing, I have the flu"
I have only had the flu once in my life and I literally couldn't move from my bed. These people may have a horrible cold (and I do have sympathy for them, it's not nice) but they are able to walk, lift their heads, eat etc. i couldn't do any of these things.
I realise I a may be generalising here and basing this on my own experience and am prepared to be told so, but Aibu to think that the sniffles, sneezes and a runny/blocked nose is not the same as having the flu and the flu is much, much worse?