With the tweet "misgendering" her trans daughter...
Quoting from:
www.vice.com/en/article/g5bepx/marjorie-taylor-greene-harassed-the-trans-child-of-a-congressional-colleague
Democratic Rep. Marie Newman spoke on the floor in support of the bill and talked about her transgender daughter, who came out to her parents two years ago.
“I knew from that day on, my daughter would be living in a nation where in most of its states, she could be discriminated against merely because of who she is,” Newman said. “And yet it was still the happiest day of my life, and my daughter has found her authentic self. And as any mother would, I swore that I would fight to ensure this country changes for the better.”
Greene retweeted a clip of Newman speaking, and personally attacked her daughter by misgendering her. “As mothers, we all love and support our children,” she wrote. “But your biological son does NOT belong in my daughters’ bathrooms, locker rooms, and sports teams.”
[End of quote]
The reference to "biological son" was a correct reference to the person's sex; and was reasonably needed to make the point that was being made. I'm sure you could find some other form of words to express the same meaning, but I don't see "biological son" as a big deal in this context. If accurately referring to someone's sex is now supposed to be a highly offensive personal attack, maybe people are getting oversensitive.
MTG didn't need to bring up her trans daughter specifically. She could have just spoken about the issue in a more general way. But if another politician introduces the subject of their trans daughter... the rhetoric used at least in these quotes is really very mild.