How do you explain public utilities? No one has any issue with the fact that flicking a light switch in your home is technically a micropayment, as it consumes extra electricity that comes out in your monthly bill.
I would venture to say that what consumers don't like about micropayments is any combination of the following:
(1) It's a pain in the ass to provide payment info most places, and comes with the looming paranoia that your data is going to be abused;
(2) It's viscerally disgusting when e.g. AAA video game developers expect you not to notice the difference between $100 for marginal extra content, and 100 micropayment charges of $1 for the same amount of marginal extra content;
(3) It's an infohazard to the average person to inform them exactly how much they're spending on each thing in their life, because it tempts them toward a culturally validated budgetary anorexia.
Public utilities avoid (1) because it's a one-time signup with trusted vendors for years of service, they avoid (2) because utilities are priced (somewhat) rationally in nationally standardized ways, and they avoid (3) because utility bills can only get so itemized.