Daffodil10 don't get too stressed at the continuing contributions to the thread from people who didn't get as far as your apology before they responded. It's fairly normal for people to decide they want to add their 2p worth after having read the OP and the first few handfuls of responses - people tend not to have time to read 460 posts to check that the thing they want to say us still worth saying. Don't take it to heart, we are just a bunch of strangers on the Internet.
You don't need to "get back in a box" or have a note to self to refrain from asking questions or insert passive-aggressive little jibes about thinking this was a forum. Just take a moment to think about how your post might be recieved by someone with expertise and knowledge in the atea when starting a new thread.
For example you could have phrased your OP like this:
Why do summer holidays need to be extended by 3 days to cover inset days when teachers have had 6 weeks off.
Could someone explain the difference between normal school holiday days when both kids and teachers are off school, and inset days when teachers are working but kids aren't?
See how this asks the same question but in a less accusatory way?
And before I get shot down I realise they may have been in school over the holidays etc.
apologies if this has been covered before. I just want to understand and I do appreciate that teachers work incredibly hard in term time
"Before I get shot down" is often code for "I know I am being incredibly goady here and I want to get my retaliation in first" - it's a phrase best avoided if you don't intend to be goady.
But what is the point in going back to school on a Thursday
our inset days are Monday-Wednesday this week and it seems odd to me to have kids only going back for Thursday and Friday
"What's the point of" is a rhetorical phrase which is usually used to mean "There is obviously no point in" - again quite goady, not acknowledging that there could be some well-thought-through reason that you haven't thought of.
I suspect that with a little more thought along these lines you would have got your answer in a simple and polite response without all these posts getting cross about the issue.