Your preface may be a little misleading. The name "goubuli" is a famed meat bun associated with Tianjin. according to various online sources this all started about 150 years ago. The guy who invented them and sold them at his extremely popular shop had a childhood nickname of gouzi, or "doggie," something along that line. It wasn't uncommon for parents to give their children a "bad" nickname. It was believed that it helped your kid's chance of survival because the gods wouldn't notice them, wouldn't think they're something precious.

Anyway, he's making these incredibly delicious and popular buns and is so busy that he no longer has time to chat with his customers. So people started jokingly saying "gouzi mai baozi, bu li ren," which means "doggie sells meat buns, ignores people." Over time it got shortened to the beginning of both phrase, just "gou bu li", "dog ignores [it]".

So, it has nothing to do with a dog ignoring a bun, but with a person ignoring other people. But as you can see, if you don't know the history, the name is meaningless, or worse, derogatory-sounding.