The wanker at the twitter office that was presumably appointed by twitter management to do that, yes? And some people want to appeal to that particular seat of power to influence and limit discourse along some dimension, within twitter.
And yet other appeals to higher powers, such as governments - control communication with deeper consequences across broader domains.
What's legal or illegal evolves with politics and culture. So there's no fundamental purchase there for the kind of moral conversation you were trying to elicit.
If in a few years the people you accuse of wanting to control other people's speech are able to get some laws passed making the speech they want controlled properly illegal, I'd venture you would resist accepting that as suddenly legitimate - even if those things would be "straight up illegal" at that point.
I guess I should have been more explicit in the first response - but what I'm suggesting is that this conversation is better had in less absolutist terms than what you proposed. There was the implication that the other person somehow inherently wanted to control communication in a qualitatively different way than you (or I did).
That's not to go down the path of sophistry - but just to suggest to orient the conversation around where the boundaries should be placed in practical terms, and discuss where the differences in boundaries lie and on an issue by issue basis evaluate that, rather than absolutist/ideological terms.
"You want to control speech (and I don't)" doesn't really lead anywhere in terms of discourse. It's a dead end.