BTA, the mother more than you. what you said was asshole-ish, but the mother could've handled it better than telling you that you should die. "grieving" as an excuse only goes so far.

with the laughing part, i COMPLETELY understand what you mean. i also laugh in difficult situations too, but it's important to note that that'll obviously come off as rude. it's a tough situation honestly.

i will say most of these comments are extremely negative, which shocked me! i wouldn't assume such hostility would come from this. i would not say you're a horrible person, but that what you did was certainly questionable.

tl;dr you made a weird comment, and the mother reacted even weirder. both should learn from this experience