I don't see why you would suspect them of not being serious. Not everyone on this site is a native English speaker. I know when I was first learning English I'd

I don't see why you would suspect them of not being serious. Not everyone on this site is a native English speaker. I know when I was first learning English I'd get tripped up by things like awful and awesome, terrific and terrible, being the only one left after your friend has left, turning the alarm off after it goes off, and so on. Plenty of things in the English language that can look like the opposite of what they actually mean.