(for Context my younger sister (7) had died from cancer a few days ago)

well as i usually do i start a convo with my mate on discord by Saying "Shoot Yourself!" after looking at his status thinking its a joke (its says "thinking of shooting myself") and then he gets a bit mad and then he says "Genuinely how do you think this is funny, in any way. Just, how?"
and it turns out his status wasnt a joke
and it turns out he's a bit down for who knows why
tried asking but he didnt say anything
then i proceed to have a tiny bit of a crashout
mainly cause my sister died of cancer a few days ago (rip) and my emotions are still feeling a bit weird,
but yeah i call him "a pathetic sack of shit"
and some other stuff
then he lectured me ending it off with "idk about you anymore" an then blocks me
so my question remains AITAH?