>who calls alphabet alphabet?

Not the same as Alphabet is the parent company and media do call it so when the parent company is fined for example. Same for Meta. Also, the press does write "X" or "X (formerly Twitter").

I replied to a comment suggesting X be a parent company to Twitter.

Not exactly. I was saying Twitter should be the product, X should be the platform. The current situation would be as if Google renamed Youtube to Google

I don't call alphabet anything because I don't talk about alphabet. Google is a subsidiary within alphabet.

I replied to a comment recommending Twitter be a subsidiary of X.