You're arguing with people talking about how things are currently by talking about how things could be or should be and how people should change how things are.
That can be a great topic on its own, but it's not the same topic others are discussing.
And unless I missed it, you didn't say "let's switch the topic", you just went off in your own direction.
I've never met an online public transit advocate who didn't come off as a zealot, lecturing the uninformed masses about the obvious benefits that will come from joining them while dismissing any criticism or skepticism as ignorance.
Unfortunately, I encounter many, many, many more public transit zealots online (and in person, though much less frequently) than I need to hear parrot the same talking points from fuckcars and NotJustBikes about the joys of living in an efficiency apartment and using a cargo bike to get my kids to and from their 3 different schools in the snow or blistering heat while ranting about vague "externalities" without ever providing actual numbers.
That can be a great topic on its own, but it's not the same topic others are discussing.
And unless I missed it, you didn't say "let's switch the topic", you just went off in your own direction.