Why do Syrians (or the Syrian subreddit) hate Lebanese so much

I was scrolling on this app and got recommended a post from the Syrian subreddit about some dude on here saying the gov of Syria is basically committing a genocide rn against Druze. I mean, I don't know much about what is happening but I know that Durze people there are being killed in broad daylight and no one be batting an eye. Why do Syrians hate em so much? Like weren't they just 'liberated' from a tragic dictatorship like not a year ago? Tf, usually oppressed ppl, when overcoming the big evil, toast together in unity and love and hug each other. And like, most them Syrian subreddit's commenters be saying how the Leb guy's opinion is ass and how Lebanon is ass and thus the fact that killing random ppl for being Durze is none of anyone's business and it's more nuanced and complex than that (genocide and mass killings ain't deep, that's why the most braindead mfs on earth commit them). Like I genuinely don't understand why everyone be hating on everyone all the time especially Syrian towards us (I know we be hating on them too but I wonder their hate where it stems from)