This is cognitive bias. You're assuming that chess is a board game that only intelligent people engage with in the first place.
This is patently false. People like xQc exist. While having a higher IQ means you would be better at chess at a higher chance, it doesn't mean that you ARE intelligent or have a high IQ. Perhaps you just enjoy board games.
This concept is so stupid and it's one of the reasons more people dont play chess. The extreme lack of self-esteem and reliance on intellectual superiority and exclusivity is stupid and it should stop
Chess is pretty sweet TBH. I've taught all of my children and others the game and they all still play. To become smug from being a chess player is just stupid.