Even though you don’t like CertainlyT, I have to admit

"you"

I think you mixed up your pronouns. You're clearing referring to yourself here. See, if you're referring to yourself, you use "I." If you're referring to others, you use "you." You don't know if I like CertainlyT or not. For all you know, he could be my favorite designer at riot. So you can't use "you" here. You have to use "I."

He is certainly... A T