Walking off when I am mid sentence. DH does it all the bloody time. If he needs to go do something, then fine say so but don’t just walk off like what I am saying is so boring and unimportant it doesn’t matter.
Equally however I think it’s rude to talk endlessly without recognising when the other person has stopped properly responding (and so is probably bored or trying to bring things to a close). MIL does this, which is perhaps why DH now has the habit of walking off mid sentence.
I suspect this is unusual but I think phoning someone is rude if you just have a brief non urgent question and could easily text or email it. It’s interrupting the other person and expecting an immediate response. A text or email, they could choose to respond to when convenient for them.
Mentioning parties or other social events to someone who wasn’t invited (but might expect to have been). Likely to hurt their feelings so just keep quiet about it FGS.
I am never sure about weight loss. Is it rude to mention it if a friend has lost lots of weight (and wanted to) or rude not to mention it??