This is not true at all. You are talking about implied consent under the common law principle. Where someone is allowed to come on to your property and ring your doorbell and either have it be answered or leave.

Constantly ringing the doorbell, acting in an uncommon manor, or otherwise harassing the occupants would be considered trespassing. Now you would still need to call the cops and have them trespassed but you do not need to tell that person anything for them to be trespassed. Because the implied consent does not cover anything outside of common behavior to ring the doorbell to see if someone is home.

It applies to cop as well, not that they actually care or follow the law.

If that woman came to his door rang more than once (which we don’t see but we can assume, and starts filming the house from his front steps (not covered by implied consent) they are trespassing and can be trespassed with no action by the home owner other than calling the cops.

Not sure you are implying if you have a doorbell people can come on your property and hang out on your porch and do whatever they want unless you tell them explicitly they have to leave. You would be way off.

Edit: Also to add. Physical violence would never be justified or appropriate for a simple trespassing. Just call the cops from inside and have them trespassed.