I wouldn't be offended. I have had all kinds of crazy questions. Some of it is people who have never been around black people much. All they know is what they know from watching "Good Hair".
Also I think a big part of the problem is us. Some black people tell "other" races stuff that is either not true or does not apply to everyone. Example, a white guy told me recently he was told by an AA that black girls don't like to get their hair wet. I wet my hair every single day and I'm black. A black coworker was telling people how we all use hair grease. Uh, I have never liked to use grease in my hair or on my scalp even when I was relaxed. It is too heavy and gives me dandruff.