If you think only fools are vulnerable to phishing, and all you have to do is look for obvious giveaways like poor spelling/grammar, you're even more likely to be phished out of hubris. Many phishing attackers are quite sophisticated. Look at this one. https://jeffreyladish.com/anatomy-of-a-rental-phishing-scam/
It's gotten to the point where everyone has to be 24/7 on alert for possible phishing attacks, and that just isn't sustainable. That's one reason I'm an advocate of petname systems.