Here, those guys and the 'cheaper energy rates' guys are set up just as you exit the self-checkout coral at every Walmart, so you literally cannot avoid them. Which is fine. I have absolutely no problem just being like 'No' without breaking stride, or ignoring them entirely. Nothing obligates you to talk to anyone else if you don't want to.
Or, I dunno... pull up your Articulated Thoughts trade/sale thread while talking to them and see if you can get them to buy some toys from you. If they can hustle, you can hustle right back.