AITA for snapping at a classmate during class?

sorry for any typos, i’m running on 4 1/2s hours of sleep.

i (18 f) I’m currently in a six week microbiology class at my local college. The class is going by super fast and therefore, we have to do a few labs a day averaging around 4 to 5 with a single day. from the first day in this class, I have noticed that Tom (30 M), is extremely arrogant cocky and a know-it-all. A perfect example of this comes from when we’re studying as a group. my other two classmates and I along with Tom like to go to a private room to study for a test, while one of our table mate is asking questions. Tom absolutely refuses to give me and our other table mate a chance to answer at all, therefore studying with him is pointless. when you try and confront him about it, he’ll simply tell you to be better and study harder, then he’ll gaslight you and say that the reason why you perform so poorly on tests is because you don’t study with him.

while doing a lab about a week ago, I accidentally messed up while setting up an agar plate. I apologize and quickly made a new agar plate. Tom berated me and said I needed “pay more attention.” I do have issues with paying attention, but on that day, I was extremely tired as I had went to bed late studying for a test that we had that morning we did the lab. on top of that both my parents work five days a week so I typically come home and deal with taking out the dogs and cleaning up whatever little chores need to be done around the house.

this treatment continues continued for a little bit until today. here’s where i be a bit of an a-hole. While doing a lab, I had grabbed the wrong test tube and put the swab in the incorrect test tube. I didn’t realize it was the wrong test tube until one of our other table mates pointed it out. I apologized profusely and said that I will take full responsibility and restart the lab. My other two table mates said that it was OK and that they understood that it had been a long morning as we had just completed a long and extremely hard test. Tom, on the other hand seemed extremely irritated. Once I finished redoing the lab. I went ahead and started to pack up while packing up. Tom looks at me and tells me, “OP, let’s try and not be rushy rushy when we come back to class on Monday.” I looked at him confused and asked what he meant by that. He then proceeds to tell me that all I do is rush and that’s why all of our labs continue to get messed up. The only other lab I’ve ever messed up was the one that I just previously mentioned. I tried to defend myself and told him that it was just an accident once again. I had stayed up super late last night studying for the test that we just taken. Once again, he continued to berate me and still told me that I rush all the time blaming me for the mishaps. I didn’t feel like confrontation so I just left class.

when I got to my car, I proceeded to text the group chat and told Tom not to parent me as I already have parents. I understand that sometimes I can be rushy, but I don’t need him to constantly berate for simple mistake mistakes that happened and it was an accident, and I took accountability for that. So far, Tom hasn’t responded to the message and neither have my other two classmates, but I feel as if I have done something wrong. AITA for putting my foot down and snapping?

edit 1: typos (ty for pointing them out!)