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Duolingo does have grammar lessons, they cover the parts of speech, rules, exceptions and interesting notes.

You actually have to click the grammar notes for each lesson, and many people skip it. Still it's up the user, not sure why this myth persists.

He was responding to another poster who said not being found guilty should make Biden immune to being taken off.

That's the context in which that was said, and you're ignoring that context. There's a big difference between saying it's also true of trump, for consistencies sake, and someone bringing it up out of the blue to advocate for trump.

You either have poor reading comprehension or you are responding in bad faith.