I really don't see what the problem is. All you have to do is be friendly. Most noobs welcome the help! I don't know why some people automatically expect to get a "**** off" and/or a smack in the gob for simply offering some helpful advice.
Quite a few times now, I've encountered noobs on the beach who were clearly in need of some assistance. A friendly "Hey mate, how's it going?" is all it takes.
If they're a noob and they're local, you get to potentially make a new kite buddy.
If they're a visitor, you get to encounter a friendly face if you ever turn up at their home beach.
If they
do turn out to be a total spanner, well, that's life I guess. At least you know to avoid them next time you see them