But Alexander defended the video, saying he did it so he could star alongside a "near naked" woman.
"You can all hate on Nickelback but you give me any reason to hang out with a near naked Brooke Burns and I'm taking it. Damn, I'll pay YOU," he posted on his Twitter account @IJasonAlexander.
Fans also used the social media site to voice their displeasure.
"Ok, one assumes this video is simply meant to be funny. But really, what were Nickelback and Jason Alexander thinking?" said @jianghomeshi.
"That new Nickelback video with Jason Alexander playing rival baristas might be the weirdest thing Ive ever seen," said @scharpling.
And @MissAndree2U said: "I really do like @IJasonAlexander and enjoy watching him. I don't know what @Nickelback was thinking."
But one fan gave the video his approval.
"In case you missed it, Nickelback and Jason Alexander (George Costanza) do THE BEST barista video of all time," posted @CoffeeGeek.
Watch the video below:
- Herald online