Because I have seen people in real life with this anxiety:

99% of us in retail give no fucks. You’re one of the hundreds, if not thousands, of faces we might see in a day. Your purchasing habits, your kinks, your personality quirks, need to be super weird/memorable for you to even begin being recognizable.

You making a thing out of it makes it stand out more than just letting it pass. You might get a smile or a giggle in the moment, but within 5 minutes you’re just some stranger who came through the line.

Hey, at least it was just the magazine. Now, if there were condoms and phallic shaped veggies being bought alongside…

Source

Don’t worry, it gets way worse. Buying a questionable magazine barely even registers,