If you're seeking a thoughtful and comprehensive understanding of how an alternative economic system to capitalism could function, it’s far more productive to engage with the works of well-established thinkers, rather than relying on the oversimplified views of teenage anarchists online. Simply debating with someone who struggles to accurately explain communism, while avoiding deeper engagement with the ideas of foundational figures such as Marx and Lenin, suggests a confirmation bias which seeks to prove the idea that communism is inherently inviable while capitalism is the best socio-economic system currently possible.
This approach of engaging with fringe voices online while ignoring the literal centuries of political theory written by communists basically only served for you to come to a more shallow conclusion, rather than one that accounts for the nuance that comes from actually engaging with the best thinkers of ideas from the other side.
I do understand that not everyone can just start reading State and Revolution, however, so you can begin by watching a lecture linked below this paragraph from someone who can actually properly explain what communism is and why they believe it to be the most viable economic system as opposed to capitalism. At least for me, it was a pretty eye opening experience. If you would like more sources or have any good-faithed questions, feel free to let me know and I will help you to the best of my abilities.
https://youtu.be/xP8CzlFhc14
Tl;dr Of course communism is going to sound stupid if the only person you let explain it to you is some teenage anarchist. Imagine if I called capitalism stupid because the only person I allowed it to be explained to me is some 14 year old terminally online libertarian on Reddit. How about you engage with the ideas of its best thinkers? Who knows, you might learn a thing or two.