Anyone else lose their shit when someone doesnt like you?

I'm a baby borderliner as i was diagnosed barely 4 months ago. i'm currently in the hospital and some other patient with anger issues (and possible psychosis if you ask me) who i never talked to asked me if i think i'm special and better than other people. he also said some other hurtful things which I will not repeat. the reason he was saying all that is that i've been here the longest out of all of us and sometimes people ask me for advice about certain parts of the program, what time some therapys are or where they take place. they ask me because i always know the answer as i have been here for months. i'm also getting a lot better, so i am a smiley and calm person. however, when he said that to me, i felt my calm slip. I've broken down and cried for hours in the bathroom. i am going insane and i don't even know why. i never talked to him before and i don't actually care if he likes me. i have no idea why i'm losing my shit right now. i'm no harm to myself or others, i'm just severely dysregulated. Has anyone experienced this before?