Zip it

Today was the second day in a row when, in a meeting, someone said "I'm not finished," right after I had rudely interrupted them, after which I immediately replied "I'm sorry" and shut my mouth for the rest of the meeting. It was just about a year ago when I began this new position when I started getting similarly offended by others who were rudely interrupting me. The only difference is that I let them continue, attributing their rude behavior to cultural differences. Though it's really no fault of their own, I've grown tired of forgiving people who are offending me this way, and it is really bothering me that I am becoming more like them.