User blog comment:CrunchyCookies/Rant on the word 'Baka'/@comment-31504968-20161016034521

It can actually offend, irritate or even anger people who are of Japanese descent, because it actually is a very horrible misuse of a foreign word, although it may look innocent.

True, it's very rude to call a Japanese person (or any person) a "baka" because it's actually derogatory and a big insult to their intelligence. It's more common to use "aho" and/or "boke" to call someone stupid or foolish, which have lighter meanings than "baka."