“The point is that Vindman has no right to expect that her should be referred to by his proper title.”
Oh, yes he does. This was a formal proceeding of the House of Representatives, and the formal rules of protocol applied. It is especially important that witnesses not be abused or demeaned during their testimony. To refer to Mr. Vindman as “Mr.” when everybody else is referred to by their proper titles is an act of disrespect. It appears to have been unintentional on the part of the speaker; the fact that he instantly corrected himself when Mr. Vindman made the point demonstrates that he too recognizes the protocol here.
“Furthermore, on the Congressional floor, it is not uncommon for the terms “Mr.” and “Ms./Mrs.” to replace “Representative”, so, your argument is only weakly supported here.”
I can imagine this happening during informal moments or when a Congressperson is not thinking, but if you watch the proceedings, they are careful to observe protocol. Ms. Pelosi is especially careful to refer to Republicans by their official titles.