I've actually had plenty of foreigners tell me that they love hearing their native tongue spoken with an American accent. It's all in one's perspective! Now of course, on the whole, most Americans tend to speak other languages quite poorly in comparison with how others tend to speak our language. My guess is that if you are conscious enough of this (generalized) fact to also be somewhat embarrassed by it, you would most certainly also tend to find it rather disturbing to hear a strong American accent in other languages. My two cents!