Is this a valid reason to be mad during sex?

So me & my bf were having sex. And I kept saying “I don’t wanna come yet” because I didn’t, I felt like I wanted to keep going all night, you know how it gets lol.

ANYWAYS so he told me to come and I did and then he came at the same time… he immediately pushes me off after .5 seconds of me coming, and tells me to go to the bathroom since he came in me. Then I tell him why does he get so mad and he says, “ because you take so long and you kept saying ‘I don’t wanna come’ like let that shit out already!” And I was just silent and left to the bathroom. I think maybe he thinks I didn’t want to come yet so that we could come at the same time , which isn’t the case. I just wanted to keep going and he still hadn’t come EITHER. So who is in the wrong here cause I feel ashamed, and embarrassed because I’m not used to “sexy” talk and I know maybe it’s not sexy, but he’s told me that before during sex that he doesn’t want to come yet but has to, and it turns both of us on. So how come when I say it, he gets mad.