I had a friend who seemed to start replacing dead-simple phrases like “seriously!?” with “are you being facetious!?”. Ugh, this doesn’t help at all. It will either scream “hey, everyone, I learned a new word!!!” to the people who know what you said, or “say what!?” to anyone else; and they will be too busy parsing your words to hear whatever you say next.
And this advice isn’t because everyone you meet will be 6 years old or a high school drop-out. Simple words are: (1) WAY easier to pick up for everyone, and (2) many people are not using their native language, including very smart people in fields where people like big words.