People easily mistake neurodivergent speech patterns and communication styles for run-of-the-mill pretentiousness.
I don’t want to get too specific right now, but a lot of people who are neurodivergent (namely autistic, but there’s lots of overlap) struggle with communication. To them, writing/typing may be far easier and more natural than speaking aloud, but it can still come off as unusually formal, overly precise, or more awkwardly structured than usual. Sometimes it’s interpreted as “pretentiousness” because it doesn’t have the same casual cadence many neurotypical writers may use.
This.
wait people consider this offensive?
Not offensive so much as irritating, I guess. It’s low-hanging fruit and easy to mock whenever people pick up on something “off” about you.
Other times, people assume that you employ formal language or “advanced” vocabulary because you’re trying too hard to sound intelligent or superior. What you intend to be clear and specific may be interpreted as condescension.