AITA for complaining about bad customer service?

just to preface this, im naturally very pro-worker, I always tip well, and as someone who's been on that side of the line i usually sympathize with retail and fast food workers, but i felt this shit was excessively bad.

cause this is something i legit never do.

but i just rolled up to the Taco Bell drive thru, and the guy on the other end answers with "whatchu want man?" in like the most droll depressed voice you ever heard

like my first thought was that he was talking to someone next to him inside and i just picked it up on the mic

so i don't say anything, and then he just repeats "I said whatchu want man?"

and i make my order, kinda flabergasted, and then when i get up to the window i just ask him "Is that the way you usually address a customer?"

and he kind of blows me off

ive never done a "talk to your manager" before in my life, but it seemed warranted. so i go inside and complain, he gets into an argument with the manager, and is told to go home. then he eyeballs me on the way out.

AITH?