OP is calling it pedantic because most people mean PT. When someone says 9am they mean 9am regardless of the timezone, they’ll add the timezone if they’re talk

OP is calling it pedantic because most people mean PT. When someone says 9am they mean 9am regardless of the timezone, they’ll add the timezone if they’re talking with someone from a different timezone but still 99% of the time they mean 9am in their own timezone so if they’re in a region that observes dst even if they said pst they really meant pdt and you’re being pedantic by correcting them.