Most people don't, since you either speak with native speakers or you speak in English mostly, since in international teams you speak in English and not one of the native languages even if nobody speaks English natively. So it is rare to hear broken non-English.

And note that understanding broken language is a skill you have to train. If you aren't used to it then it is impossible to understand what they say. You might not have been in that situation if you are an English speaker since you are so used to broken English, but it happens a lot for others.