Using "he" or "she" instead of someone's name isn't inherently rude, but context matters. If the person is present and you frequently refer to them without using their name, it might come off as dismissive or impersonal. However, in many situations, using pronouns is perfectly acceptable and can help streamline conversation. It's always best to be mindful of the preferences of those you're speaking about.
I could think of no excuse for her rudeness.
limb
Not necessarily. If someone said to you "That was a damn fine job" that is not being rude. Inappropriate perhaps. There are plenty of "appropriate" words to use instead.
Any name that is intended as an insult is considered a rude name. You can even use non-rude words to insult people, if your meaning is clear.
Bill Rude's birth name is William Edward Rude.
Yes, this is the polite way, instead of saying what which is considered rude.
If the person's name is known, then the answer depends on the context of the sentence. In general, it's considered 'sexist' to write he or she when the gender is not known--one should use he/she.
In a range name instead of using a space or hyphen, use a?
By her first name. Not so. Call her by the name she would prefer you to use. Don't presume you can use her given name, that is rude and just plain disrespectful.
Rick Rude's birth name is Richard Erwin Rood.
that boy is very rude
Limb