When I open a door for someone, especially when their hands are full, and they dont acknowledge me in the least.

Or last week, I pass this little old lady in a motorized wheelchair in 7-11 as Im grabbing (2) 40's. As I head to the register with them in hand, she's literally at the front door trying to push the doors open to leave MEANWHILE FOUR GUYS STAND IN LINE LOOKING AT HER. I fucking flip out and go hold the door, with the 40s as my hands and she thanks me with a cute smile and says Im a sweet young man. The next thing you hear is the goddamn clerk telling me to not leave without paying for the alcohol...thats when I exploded. I told him "Shut the fuck up - if anyone would have opened the goddamn door for a handicapped elderly lady, I wouldnt have to be standing outside with these drinks in my hands" then lowbrow every single mother fucker in line. Trust me, the clerk was VERY uncomfortable ringing me up. I wouldnt break the fucking murder stare at him the entire time. Rudest thing I've seen in awhile.