Steve

(snip)
So the last time I had to fly, I thought I had it figured out. I was
traveling light, with only one carry-on bag, so I removed my boots, belt,
everything that could remotely set off any alarms, stuffed them in the bag
and got in line. I handed the guard my ticket, she whipped out a green
marker, drew a line across my ticket and told me to stand against the wall
and wait for security to search me!

From what i read it sounds like you lined up and went through security in your
stocking feet. Just the oddity of that requires additional security checks. No
offense intended