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Here's my take (no offense): get over it. Since this occurred as you walked away, maybe your shirt was rumpled from getting your wallet or something and just looked suspicious. Mistakes happen. It's a human thing. You have enough on your mind with your child and wife to be angry over someone...
A lot of slicers will leave a 'tail' because of the gap between the carriage tray and the blade. I found that applying just a wee tad more pressure at the bottom of the meat when slicing will minimize the tail; for a while. Then flip the meat bottom to top and continue. There is a thread...
I generally enjoy the joke section. My choice to visit or ignore (I never ignore!). As with cable TV, there is so much that I am paying with just a basic package and do not want for many reasons so I choose to ignore those channels. My choice.