Is common courtesy now a "microaggression"?

For those who don't know what a microaggression is:

Quote:

a statement, action, or incident regarded as an instance of indirect, subtle, or unintentional discrimination against members of a marginalized group such as a racial or ethnic minority.

I just got back from the Dollar Store where I experienced something unusual. This store has 2 single-width doors, one for entry and one for exit. However, for the past couple of weeks, the exit door has been broken, so everyone enters or exits through this one door.

As I was leaving, I noticed a woman approaching the door, so I did what I always do....I opened the door and held it open, allowing her to enter first. I do this for everyone, whether you're a big burly construction worker or a frail little old lady. The normal response is a "thank you" or just a nod of the head....Heck, even no response is acceptable IMO.

However, this woman said "I can get my own door! THANK YOU!" as she walked through the door...then mumbled something under her breath as she walked off. I was taken aback...and I looked at the cashier with a puzzled look, and she just rolled her eyes and shook her head as to say "Don't worry about it, she's just a jerk".

Did I do something wrong? Is holding a door open for someone a "microaggression" that belittles the person who has the door opened for them? Or is it just common courtesy to show respect to your fellow human? I'm confused.

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