How do I deal with coworkers that dislike me? ?

I’m a 21 year old and I am a part time server. My manger loves me because I’m a hard worker and I always bring in the most sales. We just have one dishwasher (he’s in his 40s) at the moment and he works whenever I work. We used to be so close. We would talk and joke with each other. Well this 17 year old girl started working, they started to get closer. They would go in breaks together, leave together and she would work whenever he worked. I don’t really like her because she’s just gross. She opens up her legs whenever she gets the chance to and as someone who was raised right, I was raised not to associate myself with someone like her. She doesn’t like me either so one day, the dishwasher just stopped talking to me. He told someone that I was rude and that I love starting drama. He yelled at me twice in the past 24 hour. Last night, I was bussing the tea pitchers and there was no room in the bin, so I tried to squeezed it into the bin and some tea spilled. He FREAKED out and yelled at me. This morning, a new dishwasher came in and i asked the chef if he’s the new dishwasher. I guess the old dishwasher heard me saying “dishwasher” and thought I was talking about him. He freaked out again and yelled at me saying “WHY ARE YOU ALWAYS STARTING ****? IM GOING TO SHOW YOU A LESSON TODAY. IM TIRED OF PLAYING CHILDISH GAMES WIT CHU”. I am really starting to get tired of this and almost uncomfortable. He’s a felon and I heard him talking about how he’s not afraid to beat me up.