Raving Mod - you may be a mod but I disagree with you!
In that thread Kustard and Bluebell conducted a conversation between themselves, criticising the OP but not by name. They were essentially talking behind someone's back and I consider that rude!!
Alexm is justified in responding that way - and you should not get involved if you cannot understand what rudeness is!
"No of course you're not Kustard. I just get frustrated when you try to help people to make it easier for them and they don't take your advice. They are the know-all people!"
"And, Bluebell, I hate it when people don’t say thanks and can’t be bothered giving “best answers”.