Yes it really bothers me, well any person who's overly anime obsessed to the point where they know generic japanese words, especially if they say them in a high pitched voice to immitate a cartoon character. I'm sorry but...that's just childish. xD Just act normally. And most of the time they don't know what they're talking about, and people think they can learn Japanese off of solely just watching anime. Uhm, no, if you've tried learning a language, you'd understand that.

Btw, manga is not pronounced mayng-uh. It's mahng-uh. That really bothers me when people say it wrong, the japanese people will frown upon you.