We obviously don't know the full story here, but I have no idea what the issue is. He's not a cuddly teddy bear, but that's not a requirement. Nothing you have posted is even slightly inappropriate even if it doesn't feel great to hear. It can be somewhat annoying to have people nitpick at reports, but that's a sign that they care about quality. This is assuming they can back that comment up with examples and help you improve. If you want to stand up for yourself, I'd encourage you to do so. My experience with these folks is that a mature conversation about how you react to their feedback and how it impacts your behavior in supervision is likely to be well-received. Specific requests for how to improve are likely to be well received. "Stop being mean to me and only say supportive things" is not likely to go over well though. Your mileage may vary though.
I actually wish I had more supervisors like that. Only had one. Learned more from them than from all my other supervisors combined. Its just like therapy - the folks who make the most progress are almost invariably the ones who get pissed at me every now and then.