You don't even need to dress in a chicken costume. Just wear bright yellow clothes, and add a bright orange scarf/hanky around your neck or on your head. Just the appearance of it will be enough to trigger the shallow idiot. Signs with tacos drawn colorfully on them helps as well, or chickens, or both, maybe chickens eating tacos (lol). Signs that just have the word TACO will trigger him as well. Don't waste a lot of time writing out wordy signs, he can't fuckin' read. Annoying pictures get the point across. Think, simple and visual, that's what shallow people see.