No, you're right; .... And the meeting is obviously a setup: going to a Safeway is a transparent ruse to lower his defenses, to make him feel, you know, safe. Little does the OP know, supermarkets are where 99% of all crimes occur, and 100% of all murder. (And 110% of grand larceny. Am I right, people?)
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Sarcasm is not your strong suit. ....
No, his sarcasm is just fine. It may be misdirected (I'll let you two sort that out ) but his post was wonderfully sarcastic. His post started with a statement that was just barely outrageous enough that it seemed like a plausible argument, and then gradually ramped up from there so that if someone wasn't paying attention they would counter-post angrily - and then been shown how obvious it was that the original post was obviously not serious.
I would give this high marks for sarcasm technique....