Well, the attendee is just rude. Don't give her another thought. She just behaved badly.

The building maintenance guy is acting like building maintenance guys always do.

Sorry any builders or plumbers who are out there but WHAT IS WITH YOU?

I was going to say, if it's in the workplace, professionalism is best. In fact, it can be helpful in all situations.

Professionalism means never raising your voice. Never replying with sarcasm. (Both of which you managed). Calmly repeating what you said the first time, but in slightly different words.

"Yes. I know you needed some things. But, it's like I said, I am not feeling up to it."

You can make your voice a little sterner when you are repeating it. This will discourage them from continuing the conversation. And it will stick in their head that this is how you will deal with them if they behave badly again.

As of you're talking to a child, really.

To the maintenance guy:

"I realise it's a big deal to get a new machine. But that's what needs to happen. As I said, I haven't written any notes of any kind. I came straight to you with this. Can you suggest what we do next?"

Again, 'As I said before' is the key phrase.

These are situations you need to shut down, as oppose to open up.

It feels crap to have someone's sarcastic final words laying on you. So, have the final (calm but firm) word.

Yes, I do work with the public.

Hope these suggestions help.