
Too bad
Empathetic Tone
Use 'too bad' to show empathy when reacting to minor disappointments or problems, not serious tragedies. 
Casual Speech
'Too bad' is usually informal and best suited for conversations with friends, not in formal settings. 
Slight Sarcasm
Sometimes 'too bad' can have a sarcastic edge, so be careful with your tone to avoid misunderstanding. 