Is it normal that my friend really pissed me off by doing this?

When me and my friend went on our last night out, she really pissed me off. All night she had men coming up to her, trying it on and she was over the top flirting with them even though she has a boyfriend.
But when a man started flirting with me or my other friend, she would grab their arm and tell them to piss off and that we weren't interested, even though we really were! We are both single and quite frankly, like going out and getting with men casually. Even my friend told her to her face she was getting quite pissed off that she was pushing men away from us but she still carried on. And she still carrried on grinding on men and over the toply flirting and we didn't stop her.
is it normal that I am so angry with her? This is totally out of character for her but it's almost like she is jealous of me and my other friends being single and able to have fun. I made up an excuse not to go out with her the next time because I just can't watch her threatening men with violence when one shows any interest in me. It's to the point where I cannot wait to move away in a few months so I don't have to see her ever again if I choose to.
Sorry if this sounds childish but I cannot stand her sudden change of personality. So is it normal and does anyone have advice? Thanks.