What you ignored was a confrontation but made assumptions and judgements about the person, their work, and their ability to work from home and concluded the issue was with working from home, without providing feedback or attempting to learn more about the situation, and then complained on the internet. How would you like it if your work performance/feedback was handled this way? IMHO, I don't think that's a very professional way to handle a work issue/relationship. I would have been more sympathetic to your issue if you had made an attempt to provide feedback or tried to resolve your problem, and if the other party failed to help.

What assumptions did I make, other than that if they can hear a toddler and a cartoon in the room, and if their job is phone calls, then they should take care that this isn’t distracting on phone calls?

I don’t have a relationship with them- they’re one agent of a handful, whom I’m obligated by my client to call a couple times a year.

I’m not in a position to give feedback on their work performance. Nobody needs me to have a confrontation with them. I’m not their coworker, boss or direct customer.

This is a HN post about WFH and I’ve shared an anecdote about somebody’s toddler babbling during our work call.

I admit mine is an unpopular opinion- we’re supposed to celebrate parents who work so hard to balance their duties with their entirely elective decision to have children.