Do we think before we speak?

Do we think before we speak. Do any of you think about conversations we've had with others and ever wonder if we innocently said or asked a question that would be offensive to another person? Well, I sure have been thinking about this alot lately. I am mexican or as I have been called mexiCAN'T because I do know how to speak spanish. I am currently enrolled in a spanish class to learn the language. I have been ...let's see how shall I put this...nicely? I have been..."entertained" by some of my classmates who have aquired a thick mexican accent since we started the class. Yes, it could be cute...I even smiled once or twice but still I found myself a little more bothered by this than I would've thought.
Afterall, I am a great lover of comedy. I love to joke around and my family and I do alot. We often joke with fake mexican accents (fake because we grew up only speaking english), yet listening to my classmates continually speak in these thick mexican accents and talking about burritos, tacos and siestas well, I didn't think it was too funny anymore. I wondered if the assumption is that all mexicans speak this way and that all we talk about is burritos and crap, I just remembered I have beans and homemade tortillas for lunch! How much more mexican can you get! Why didn't I pack an "american" looking lunch?!?!
Since I started experiencing these feelings in my spanish class it made me think about how I may have innocently offended someone by asking them about their culture because I assumed they were not from this country. I have wanted to become more aware of how I communicate or may communicate with people I meet so that I do not offend someone. Being the only mexican in an all caucasion spanish class has been eye opening. Now it's my turn to open some eyes too ;)
Let's think before we speak, yay!