No specific laws in Texas make it illegal to use profanity or "cuss out" a fast food or other service worker.
That doesn't mean being rude or abusive to a service worker in our state or anywhere else is totally free of consequences. According to the Texas Penal Code, it is clear that certain behaviors, including the use of abusive, indecent, profane, or vulgar language in a public place, can be illegal.
A TikToker stopped by a Wingstop after hours and caught an employee working alone in their undies and wrapped in a plastic bag...because that's totally normal.