Nothing is wrong with thinking they lie.
When it comes to flat earth though, you can debunk it yourself with incredibly simple tests, at home.
Saw what on TV?
That is irrelevant to the point I just made.
The earth is curved, and you can test that yourself, at home, very easily.
Obviously the pictures they show are CGI, it doesn't make the world flat though.
No. People know. It is terribly easy to prove the earth is curved. Go try it.
Buy a drone, wait for sunset, fly the drone straight up…watch the sun come back up over the horizon. = curve.
You can do it with your naked eye too. Find an object on the horizon, take a few steps backward until it disappears, climb in altitude, see it reappear. = curve
Altitude won't change the maximum distance your eyes can see.