I always consider someone might have an LD that makes things like spelling and grammar devilishly hard. I don't pay any attention to it and concentrate on the content - especially in forums, texts, and other casual communication. I have kids and siblings with dyslexia and CAPD. So smart - so bad at spelling and written grammar, lol.
Everyone is different. Some people are really good at grammar and spelling, some are not. Same for geography or history or math or computer games, empathy, basketball, running, cooking, painting, blah blah blah. So many things.