Why can I read this fairly easily while you might have difficulty reading or not be able to read this at all?

The key is context.  I have much more and a greater sense of context, so I can more easily fill in with appropriate expectations.

In fact, sometimes having too much context works against us.  “Smart” people, people with higher levels of education and reading comprehension, have more difficulty reading what lower proficiency readers wouldn’t miss.

Paris in the the spring

What’s the lesson?  Remember when you speak to other non-native English speakers in English.  They might not have your context and understanding of idioms or even vocabulary.  Remember your audience and speak simply.