Michael Bay and George Lucas must be best buds who sit around talking about ways to work stereotypical accents into CGI characters. Honestly, most kids nowadays barely speak proper English. I doubt aliens talking with Chinese or black accents is shocking/offending kids. Now a Transformer speaking eloquently: that'd be weird.
I'm more offended Bay and Lucas keep making the same movies over and over. We get it. Star wars has a never ending Universe of characters and blowing stuff up is fun.
Honestly, Hollywood is run by a bunch of old, rich, white men. Do you think they care (or even notice) if a major motion picture has characters with offensive stereotypes?