[dudul]

So first, let's get the ad hominem out of the way. I speak 2 languages fluently in addition to my native language after living in 4 countries throughout my life, so don't patronize me.

Then, your argument is so silly that I wonder if you're just being contrarian for the sake of it. By your logic, anyone speaking language A should make sure to dumb it down as much as possible, make it extremely basic to make sure that anyone in the world who doesn't have a good grasp on language A can understand it unambiguously.

First of all, I don't owe you anything. If I decide to type a tweet in Italian, or Russian or whatever I don't have to accommodate you. If you don't understand the language, you're clearly not my target audience. Even though you can click on my tweet to read it doesn't mean that I need to make sure someone who doesn't understand the language can read it.

Second, this is a total disservice to people learning the language to not use idiom and common constructs. These are expressions people use in real life, if they are serious about wanting to learn a language they want to be exposed to them.