I highly doubt that the laundromat guy had shit-stained pants. Maybe he was playing in the yard with his kid earlier in the day and got dirty. Maybe he's a mechanic and got some stains on his clothes while rotating tires and changing oil. Or maybe he has a hobby that involves something like paint, or varnish, and he spilled some. IIRC she's mentioned men with shit-stained pants before, and I find it hard to believe she had such an encounter once, let alone multiple times. She doesn't seem to have a single thought beyond carbs, dipping sauces, and either giggling or reeeeing about poop.