It may be just me, because quite a few people repeatedly say this to me.
I'm having a bit of a rubbish time, without going into details I'm probably not all I appear to be. As in I probably look on the outside like I've got it all sorted, but I've been through some really bad times in my life that have affected my mental health. I always keep on going and don't let anything stop me, but can get down in the dumps at times.
When I get a bit down sometimes and it probably shows, not to the point that I'm rude to people but just looking fed up and sad. People, usually at work will ask how you are and I'll usually just say not too bad then they might enquire a bit more if everything is ok. I'll brush it off and just say yes you know, just life sometimes and laugh it off. At which point I always get told that I should be grateful, or that I'm so lucky, or I'm so fortunate, or that there's people much worse off than me. Always said in a disapproving way.
They don't have a clue what is going on in my life to say that and I find it quite insensitive.