Well then, it seems like you presume to know what message they intended to communicate with the rainbow or Mexican flag displayed on their vehicle.
So, when others presume to know what your symbol means, they are "too ignorant to get to know [you] first before passing judgement," and "they are the ones with the problem."
But, when you see their symbol and judge them without getting to know them, it's okay. You're not "ignorant," you're qualified to make the call.
No offense but, that looks like a double standard from here.
Okay, let me get my hermetically sealed bubble with the grey suit that is PC "non-offensive to anybody" out and run around. Geez talk about nickle and diming a subject to death. If you aren't a lawyer, perhaps you should consider a career change. As for me, I'll just carry on. As Thomas Jefferson stated "What do I care what they practice, if it neither picks my pocket, nor breaks my leg" (or something to that effect). By the way, most cars that I've seen waving a Mexican flag have Hispanics in them. Rainbow flags are displayed by Liberals, or gays and you can usually tell by the other bumper stickers they have, like "War kills people" or "Respect Mother Earth" or "Buck Fush" or "Kerry/Edwards". How do I know this, because we have a huge liberal community not too far away from where I live. We call it "The Peoples Republic of Boulder".