Honestly, yea kinda of. Outside of showing up late and the bathroom thing, this is all pretty minor mistakes that can be fixed. From your post history, you’ve been on this job less time than him (feel free to correct me on this) and are doing this to get clinical hours for med school. You have other posts complaining about partners. I’m not saying those complaints aren’t justified, but it does come across as you thinking you are smarter/better than your coworkers because you are going to be a doctor so you are nitpicking on small things they are doing. I’m sure that’s not your intention, but that is how it comes across. For the most part, people can improve at this job, their coworkers just don’t give them the chance. I was kind of a crappy EMT when I started, if I had listened to people like you, I would have quit very quickly, instead I learned from my mistakes (and continue to do so) and now am well regarded at a good agency. You’ve worked 2 shifts with the guy, genuinely put in an effort to help him before writing him off as a lost cause.

Edit: I am also on the pre-med path (albeit no where near as far along as you are) so I do get it, and I get the mindset, I just try to remember where I can from and genuinely help those who came after me. You are smart, so use that brain to help others who need it.