Why is my boyfriend's brother mean to me?

Anonymous
so I went over to my boyfriends house and met his brother for the first time. his brother didn't introduce himself and he wasn't very friendly. he just kinda sat there and didn't look at me. when he was talking to me he wouldn't even look at me. he just handed the hookah hose to me kinda his way of saying "wanna smoke some?" but he never looked at me or said anything. he told my boyfriend he felt gross because he didn't take a shower but he wouldn't leave the room it took him a long time to leave my bf's room. and he picked up my flip flops and joked saying "hey, you want your flip flops?" and he was talking to my boyfriend. then he took out the guitar and played a song to his friend and said that I clapped once he was down to my boyfriend. well he finally left and me and my boyfriend had some "fun" and his brother wouldn't stop knocking on the door to come in. he took a shower and I went upstairs with my boyfriend to get food and his brother wouldn't stop staring at me. I asked him where the trashcan was and he said "in the fridge". I was pouring syrup on my waffles and his brother was like "way too much! too much! you like drowned them in syrup" and pretty much everything I did his brother would comment on it. I got up to get a drink and his brother said "sit down right now!" and I when I sat down his brother said "hey is your natural hair color blonde? I bet it's brown because I can see your roots" his brother is 15 by the way so I don't know. he also had a girlfriend. I honestly don't know how that's possible
Why is my boyfriend's brother mean to me?
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