mchernan, this is an etiquette site, and so posters were addressing the etiquette issues in your post. I don't think DottyG was being condescending, she was simply trying to make a point that didn't seem to be worded correctly, thus the multiple clarification posts. You are of course entitled to your opinion, and may think its weird that your in-laws never entertain, but again, on an etiquette board, its inevitable that others will point out that its their right to do so.
Aquigoth is correct. You cannot forbid someone to post here. I have been very nice in answering your question. Even to the point of posting that you do have a very valid complaint and that I've suspected that you merely chose a word that has a different connotation to it than you might be realizing. I have even gone as far as trying to get things redirected to what I think you're actually asking.
Can you think it's "weird"? Of course you can. By all means feel free to feel any which way you choose. And, I have never said that my point is the only "truth." But, it is not right of you to say that I am no longer allowed to voice an opinion here. You posted at an etiquette site. I have an opinion. I'm sorry that you don't like that opinion. My opinion may not even be completely right. But, it's no less of a right for me to have mine as it is to have yours.
I fail to see where you've found what I've said "condescending" when I've even posted that I agree with you. Several times, I have stated this. Directly stated this. ITALICIZED it even!

I have put a tone into my postings to where you would understand that
I AM on your side and that I've agreed with you! That's not condescending!
Edited to add
BOLD - the italics weren't working.

Will even say it again, so that everyone is clear on this......THE OP'S IN-LAWS ARE DOING SOMETHING RUDE. I COMPLETELY AGREE WITH THIS FACT.

And, since it appears that there's a slight disagreement between the wording, I'm fine with dropping the issue of the "size of the house as to how many people should be invited in" issue.
If that's the source of the upset, fine. I'm ok with dropping it.(And, OP, I actually am a nice person. Truly I am. And, it's ok if we don't, always, agree here. That's the beauty of this place. We can disagree in one thread and be "best friends" in another one.

It's one of the things people like here. I'm sorry that your 1st thread in here has, in your mind, turned nasty. That was not my intent at all. I do welcome you and hope that you look around the place and find it a comfortable - and enlightening - place to be. We all learn a lot here. It's a warm and welcoming place that'll become addictive before you know it!

)