Well to make it believable let's use a topic that sounds good. Let's say someone was bitching about how all international students are nothing but leeches and possible terrorists that should not be allowed in the country. That ties in with the fact that I am a mexican national and a college student. Then we can expand with comments about those who set boobie traps and such for illegal aliens and shoot them and such. We can say someone compared it to trapping rats. Those types of comments would be sure to piss me off. From there it is easy to say that the discussion descended into racist remarks which were escalating in their severity. I think that sounds believable.