Wow Sabrina.
Okay, line by line:
Not this poor woman's fault you were a lazy cow and still stinking in your pit at 8am on a weekday. Try getting up at a reasonable hour and you wouldn't have had the problem, would you?
Lots of people are not up at 8am - shift work, working late at home, or in this OP's case, travelling late home the night before with her kids. None of this can be described as "lazy".
Secondly, you sound like a massive bitch. Let the poor cow in already.
Why is not wanting to be woken up by a stranger who is demanding a favour of you being a "massive bitch"?
Gated communities are for the terminally smug and snobbish, and you sound like a prime example.
Lots of council estates are now essentially gated communities, as a result of attempts to improve security. Same with other blocks of flats. I live in a block of flats that I suppose I could now call a "gated community", but it was just a big boring block of flats when I moved in, and gates were installed a few years ago. (I wish they hadn't as it doesn't really help security, just means I have to remember the keycard.)
On the original question from mrsruffallo, I think she was NBU. You aren't supposed to let strangers in just because they buzz, otherwise there's no point to the gates. This stranger did not offer any info about themselves, and they were totally out of order to keep on buzzing someone who had asked them to stop. I get that they must have been frustrated not to get entry, but they could have just called their estate agent who handled them getting the house.