YB, it hasn't died. You proved that with this post.
One can never worry about those around you. Meaning, you do what you think is right and if you can affect those in your life that look to you for guidance, then you will continue your ideals and values. Teach your boys well. Teach them to respect everyone, no matter what color, size, gender, age, religion, etc. You'll make a better world and your kids will be better people.
Personally, I am probably over polite, if there is such a thing. I say thank you, good welcome, no worries, more than I should I think...sometimes I come off being weak.
It's probably because you're a minority, and short. If you came off as a prick it wouldn't take much for Billy Badass to drop kick you back to where-ever your parents come from.
But that's not how I feel. I think you're swell and your manners complement your stature quite nicely.