How do people lose against Teemo?

I get that he's incredibly frustrating to play against due to his poison and mushrooms But i just can't wrap my head around how he can win as he just ruins every comp he's placed in. The only way i see people losing against teemo is by getting tilted and just playing incredibly bad. Sure, he wins against melee champs in lane. But unless the rest of the team gets absolutely destroyed to the point where an inhib is down at 18 minutes, i can not see a way that teemo wins a game. EDIT: yes, i have played against teemo and won. I have played with teemo and lost.
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