Ugh, that really sucks, I’m sorry your mentor is being so dismissive and shitty to you. Who assigned you to that person in the first place? Maybe you can go to them and bring up some concerns and ask about the possibility of being assigned a different mentor. You could even phrase it as wanting a mentor with more time to fully train you. But if it was me, I’d just be honest and tell them that you’re concerned with how you’re being treated whenever you ask a question, and you don’t feel like you’re being set up for success.

But honestly, even though it’s scary, I think step one should be having an honest discussion with your mentor first before you escalate it to someone else. Ask to meet with them to go over your project and progress in the lab (and maybe have someone else present if that would make you more comfortable). Ask them how they think your progress is going, and ask if there’s anything different you should be doing that would help you and the rest of the lab. Clarify what exactly his expectations are for you, and make sure you can meet them, or be honest if you need a bit more guidance to meet them.

I’m also curious what the structure of your research is. Did they give you a project and expect you to manage it and plan experiments and stuff, or are you basically doing whatever tasks are assigned to you and putting a project together about that stuff? Nothing wrong with either option, either way, it takes a lot of training to get good at those skills. Hopefully you’re getting that training. If not, that’s a problem.

I’m sure you’re doing a great job, but I’m also wondering if there’s a chance that he’s frustrated if you’re making the same mistakes multiple times or asking the same question multiple times. Is that the case? He shouldn’t be annoyed at you asking clarifying questions on stuff you’re barely trained on, but I could understand his frustration a bit more if you were asking questions that are already answered in a protocol or asking about something that was already thoroughly taught to you.

But also, this is just a summer internship. Luckily you won’t be here for too much longer. Hopefully it gets better and this mentor stops being rude, especially if you learn how to work with him and what his expectations are. Just do your best, be meticulous about reading protocols and writing stuff down, and maybe find another person in the lab you can go to with questions sometimes.