I am so dreadfully sorry that I was in conversation with my husband, and neglected to notice that you held the door for us to enter the establishment. I am sure my error was compounded in triplicate because you are black and I am white. I can assure you it wasn’t intentional, nor do I expect such service from strangers, or black people in particular. Neither my husband or I am visibly handicapped, so you offered (of your own volition) to hold the door which you could clearly see we were capable of opening ourselves. That was both courteous, and kind of you.
What wasn’t, was your announcement in overly loud voice of that sarcastic “You’re WELCOME” when we neglected to immediately and profusely thank you ourselves for your kind (and unnecessary) gesture. Believe me, your deliberate rudeness put our unintentional forgetfulness squarely even and then some.
Why bother to offer a kindness (necessary or not) if all you are after is the public notice of your nobleness? And your conduct when you didn’t get your thanks (for whatever reason) certainly left us both with a clear impression of your “nobleness,” didn’t it?
Yes, it is our usual habit to acknowledge such a gesture with spoken thanks. Yes, we were engaged in our conversation, and we forgot to thank you. I don’t believe I have lowered myself to that level when my polite gestures have gone unrewarded and unnoticed, and if I ever have, I am thoroughly and utterly ashamed of myself.