personally bro, if my day/life is not going as well as I'd like it to be, I simply respond with the Islamic response "AlHamdulillah Ala kulli haal" which basically means "Praise God under all circumstances"

Sometimes people, even those we perceive to be under severe trials may still respond positively when asked about their affairs. This may not be lying on their part. Rather they may have not want to whine about their problems to all and sundry specially those who cannot be of help. On the other hand they maybe focusing on their blessings, rather than their trials, and thus still feel grateful for what they have. And those are truly admirable traits IMO. And not supposed to be interpreted to mean they are being untruthful.