they don't understand that lightning uses onion routing to send payments, it's pathetic
Discussion
they do, you just don't listen.
Lightning users love to point this out, but it's only somewhat similar to onion routing.
Every node on Tor is directly connected, or has the potential to directly connect, with every other node. Lightning Network payment channels do not fully-connect.
The entire network and the network topology is also publicly known for routing nodes and natural incentives of this mean traffic consolidates to a few large nodes negating any remaining similarities or benefits of Tor.