ALL BECAUSE I FARTED 😂😳😡 but seriously

So my (idk what to call him right now) and I are just going through it all.  Maybe it's me and maybe it's not idk but I feel like he's tryna make me feel like a piece of shit because he gets mad all the time over nothing LITERALLY!! Things like snickering or little laugh cause I think of something or something happens and he happens to hear me laugh and ask what's funny I say nothing... ONLY because when he does it he says the same exact thing ( oh nothing just something I thought) this makes no sense to me as to why a full argument came from this because I didn't tell him what I laughed about. Mind you it was because I farted and didn't know if anyone heard it that was around. I didn't want to tell him because his brothers walking right behind and I didint want to announce I farted... Is that reasonable as to why I didn't say anything?