Is it normal that my mom literally locked me out of the house?

I am 18 years old, and yesterday, I brought my new boyfriend and another friend home, and we had a nice conversation with my mother. She was perfectly happy. I left at about 2 p.m., and then came back at about 11 p.m. with both of them. We talked in my room for about half an hour(waiting for my friend to be picked up) perhaps a bit loudly at times. Meanwhile, my mom was watching tv in the living room. After walking my friends down and coming back up to my apartment, I realize that my house key is missing from my key chain, which I had left in the front hall while in my room. My mother has removed the key. I bang on the door for a half hour, yelling, but she refuses to answer the door. I call my father, who is on a business trip overseas, but she refuses to answer. She knows I have no money or anything on me. I then get an email from my mother to my father, with myself cc'ed: "You will have to find (my name) a place to life. Last week, she brought a strange guy in around 0100, when I was in bed.(side note: in actual fact, it was Canada day, and after a night of being out, I called my mom and asked her if I could bring over my friend and her boyfriend so they could get picked up from my house - and she agreed - not a strange guy) Tonight, she came home at 1145 with her boyfriend and (my friend). i don't think (my friend) would be doing this with her family. So, I want (my name) out of my condo ASAP." Next email: "I took (my name's) keys. She just left. I'm not taking her back. She's in bed everyday until 4:00 (side note: not true, but I do often sleep in until 2/3 on weekends). Today, she and her boyfriend were here. Both of them had their feet on my coffee table. This is a lazy and slovenly lifestyle, which Alexandra did not learn from us. I think I've had enough humiliation for one day." As you might imagine, I was very confused. I am sorry for my behaviour, but I didn't think this was reason enough to be kicked out. I finally leave, and I ended up staying at my boyfriend's house the night. I come back the next night, tonight, and she did answer the door. She lets me come in, and sits beside me, staring at me, for a couple minutes, and says my behaviour (bringing 2 friends over at 11 p.m. so they could wait to be picked up) was what people on welfare do. That is all that has happened, and she has now gone to bed. Basically, what I am asking is, is this normal behaviour? You might think it is me, and I am underestimating my own actions. But I really have not done anything other than what I have written. The past few weeks she has been getting mad at me more, saying I'm as toxic as her marriage was.