How do I make a remote controlled fan turn on with the light switch?
And this is why I hate remote controlled fans.

You have two options: One remove the switch and replace with a one gang remote for the brand of fan you have.  Example, this one.  

The other, which is my preferred, is to hardwire the fan by removing the remote unit.  If the ceiling box was already wired for ceiling fans with two separate switched hots then all you need to do is change the switches for ones designed to control the fan speed.  If you only have a single switched hot, can you replace the switch and remote unit with a wired remote like this one.  This will transmit the light/fan control over the power wire to the fan unit.