The Do not chase concept is easy right….So why do people still do it? The secret to beating a singed whether proxy or not is that he has to over extend meaning if you build early magic resist with your jungle you can shut him down.
Good choices vs a singed would be Teemo because of the great poke and speed he gets. If you have to play the bruiser rush the magic resist and let him push the wave so you can far under turret if he tries to proxy, call for an assist from both mid and jungle and get him shut down so you can free farm your way back in. Also try Rumble and kennen vs him, just avoid the flip and wait for 6 to hard engage him.