<human>: What turns you off so badly that you're not even able to continue doing your job properly? What gets you out of your good mood?

I'll share mine. I was with some Serbian guy a few months ago, and we started making out. One thing led to another and I started giving him a pretty decent handjob. He wasn't that good in speaking English, but that didn't stop him from expressing his joy. He said: "Do you want me to come on your teeths?" Now let me tell you that I instantly froze in my spot and I couldn't focus anymore on what I was doing. I lost it. It wouldn't have been bad if he had said "tits", cause at least it would have been correcltly expressed, but he didn't! I wanted to punch him in his "teeths". So I just faked a smile, continued whatever I was doing for a few minutes, and then told him that we should go to bed and that I am tired. Not my best night.

Summarize the given text in a few sentences.
<bot>: gave a not-native-English-speaking guy a handjob. he said "wanna come on your teeths?" instant turn off, thank you very much.