The way I like to think about it is that I imagine, and am probably right, that the person on the other end of the review approaches it the same way I do - When I do my reviews, I don't particularly care who's work it is, I only care about the code itself and the problem it's trying to solve. My feedback doesn't come from a malicious place, it comes from wanting the codebase to be in the best possible state it can be given our collective knowledge. Why would the other person be doing it any differently?

Sure, there's always going to be assholes and people that are just straight up mean for the sake of being mean, but in my experience those types of people don't last long anywhere because nobody wants to put up with their shit.